The Clone Wars - S4E19 - "Massacre"

2:15 - Mother Talzin (to Ventress):  "And then you will fulfill your destiny and become a true Night Sister."  Emperor Palpatine uses the same expression in Return of the Jedi when he tells Luke, "Now fulfill your destiny, and take your father's place at my side" [1:53:38].

2:54 - Count Dooku (to Grievous):  "Go there, and wipe the witches out, all of them."  Darth Sidious uses the same expression in The Phantom Menace (talking to Nute Gunray and referring to the Gungans):  "Wipe them out, all of them" [1:44:52].

5:22 - General Grievous (to a battle droid):  "Begin landing our troops."  Darth Sidious says almost the same thing to Nute Gunray in The Phantom Menace:  "Begin landing your troops" [4:46].

16:05 - Mother Talzin:  "Pain, Count Dooku.  You will know terrible pain."  This is similar to what Yoda says to Mace Windu in Attack of the Clones:  "Young Skywalker is in pain, terrible pain" [1:21:27].

The Clone Wars - S4E18 - "Crisis on Naboo"

8:59 - Derrown (in disguise as a senate guard):  "What's your identification number?"

Senate Guard:  "SG 1984."

Derrown:  "Alright, move along, and stay sharp."

This exchange includes three bits of dialogue borrowed from A New Hope:  an Imperial officer asks Han, "What's your operating number?" [1:15:41]; a sandtrooper in Mos Eisley, prompted by Obi-Wan's influence through the Force, tell Luke to "Move along.  Move along." [43:51]; and Han says, "Stay sharp" twice, once to Chewbacca before making the jump to hyperspace away from Tatooine [56:08] and once to Luke shortly before the Death Star's sentry ships attack [1:34:15].

9:28 - Part of the fireworks display is apparently meant to resemble the opening crawl of the features:

10:31 - Hardeen (about his sniper rifle):  "Blast!  It's only good for one shot."  Obi-Wan also says "Blast!" when Jango Fett ambushes him in Attack of the Clones ("Blast!  This is why I hate flying!" [1:08:22]), and Luke says it twice in A New Hope:  after R2-D2 disappears ("Blast it!" [26:49]) and when a TIE fighter is behind him during the Battle of Yavin ("Blast it, Biggs, where are you?" [1:49:09]).

14:06 - Cad Bane (after discovering that Hardeen was Obi-Wan in disguise):  "Something smelled wrong about you from the start."  While not exactly the same, this seems to be an echo of what Leia says to Tarkin in A New Hope:  "I recognized your foul stench when I was brought on board" [57:17].

17:42 - The door opens to reveal Dooku at the end of a banquet table in the same way that Darth Vader is revealed in Cloud City in The Empire Strikes Back [1:28:20].

17:50 - Chancellor Palpatine: "It's a trap!"  Admiral Ackbar says, "It's a trap!" in Return of the Jedi [1:35:03], and Leia says it twice in The Empire Strikes Back [1:39:50].

20:02 - Obi-Wan (to Anakin):  "Are you alright?"  In The Phantom Menace, Anakin asks Qui-Gon, "Are you alright?" [1:17:31] and Padmé asks Anakin, "You alright?" [1:19:06].  In Attack of the Clones, Padmé asks Anakin, "Ani, are you alright?" [50:02], and later a clone trooper asks Padmé, "Are you alright?" [2:05:54].  In Revenge of the Sith, Anakin asks the Chancellor, "Are you alright?"[11:49], and a bit later, Mace Windu asks him, "Chancellor Palpatine, are you alright?" [24:53].  Padmé also asks Anakin, "Are you alright?" [1:27:59].  In A New Hope, Luke asks Obi-Wan this [59:16] and Biggs asks Luke [1:46:44], and in The Empire Strikes Back, Luke asks, "Rogue Two, are you alright?" [30:31].  Twice in The Empire Strikes Back, Han asks this with a shortened "You alright?" once to Luke [22:12] and once to Leia [31:39].  Luke also asks Han, "Are you alright?" when they're captured by Jabba in Return of the Jedi [28:31].

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There are brief cues of the Imperial march at 15:18 (when Anakin expresses his anger that the Jedi council lied to him) and 17:31 (when he admits to the chancellor with some disdain that the plan to disguise Obi-Wan wasn't his).

The Clone Wars - S4E17 - "The Box"

3:05 - Yoda:  "Skywalker, a powerful Jedi you are."  He describes Anakin this way while speaking to Luke in The Empire Strikes Back, too:  "Oh, father, powerful Jedi was he" [55:18].

3:25 - Yoda (to Anakin, about Obi-Wan):  "If you leave, help him you could, but his future uncertain is."  He tells Luke something similar in The Empire Strikes Back:  "If you leave now, help them you could, but you would destroy all for which they have fought and suffered" [1:18:05].

7:38 - Hardeen: "Dioxis!  Breathe it, and you're dead."  In The Phantom Menace, Quin-Gon also announces "Dioxis" [5:20].

10:22 - Count Dooku (about Hardeen):  "Impressive."  Vader gives a similar compliment to Luke in The Empire Strikes Back:  "Impressive, most impressive" [1:44:30].

17:53 - Moralo Eval:  "This is not the first time you've saved everybody's skin, Hardeen."  Leia uses the same expression in A New Hope ("Somebody has to save our skins" [1:18:22]), and Anakin uses it in Revenge of the Sith (when he tells Obi-Wan, "Alright, but you owe me one, and not for saving your skin for the tenth time" [24:38]).

The Clone Wars - S4E16 - "Friends and Enemies"

3:25 - Cad Bane looks at a hat like Indiana Jones':

[source]

7:44 - Some of the panels in the background have the same hexagon pattern that's also seen in the homestead garage in Attack of the Clones and A New Hope:

9:02 - Obi-Wan (as Hardeen) reaches up to his bound feet to use the Force to release them.  There's a similar shot in The Empire Strikes Back where Luke reaches up in a vain attempt to free his own bound feet [9:01]:

12:49 - Cad Bane (about Hardeen's suggestion to split Eval's reward fifty-fifty):  "Over my dead corpse."

Hardeen:  "Don't tempt me."

There's a similar exchange in A New Hope.  After Greedo tells Han Solo that Jabba may take his (Han's) ship, Han says, "Over my dead body" to which Greedo replies, "That's the idea" [50:42].

16:31 - Moralo Eval:  "Who sells a ship with only enough fuel to get to this lousy rock?"  In A New Hope, Luke also disdainfully calls a planet a rock; after C-3PO asks if there's anything he can do to help, he replies, "Not unless you can alter time, speed up the harvest, or teleport me off this rock" [19:58].

19:47 - Anakin:  "You're going to pay for what you did."

Hardeen:  "You shouldn't have gotten involved."

There are two similarities here.  In Attack of the Clones, Anakin says almost the same thing:  "You're gonna pay for all the Jedi that you killed today, Dooku" [2:04:51], and in A New Hope, Obi-Wan uses the same expression when he tells Luke, "He [Luke's uncle] didn't hold with your father's ideals, thought he should have stayed here and not gotten involved" [32:42].

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Moralo Eval's armor is similar to that of General Veers, Dengar, and the snowtroopers:

[source]

The helmet that Hardeen wears is based on a piece of Ralph McQuarrie concept art for Boba Fett:

[source]

It's even mentioned specifically in this video:

The Clone Wars - S4E15 - "Deception"

3:13 - This shot of Ahsoka and Plo Koon at Obi-Wan's fake funeral is somewhat similar to a shot of Anakin and Obi-Wan at Qui-Gon's funeral in The Phantom Menace [2:07:35]:

7:27 - Rako Hardeen (as he sees Obi-Wan disguised as him):  "What the?"  In Attack of the Clones, an alien on Coruscant makes this same exclamation as he sees Obi-Wan flying through traffic while hanging from a droid [15:08]; Han Solo says it in A New Hope after emerging from hyperspace into a meteor shower [1:03:15], and in Return of the Jedi, a scout trooper says this after being hit by Wicket [1:05:38].

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According to the trivia in the episode guide on the Star Wars website (my source for both of these images), Hardeen's helmet is based on a rebel trooper concept from Return of the Jedi.

The Clone Wars - S4E14 - "A Friend in Need"

19:53 - Ahsoka (to R2-D2):  "That's two I owe ya."  Han Solo has a similar line in The Empire Strikes Back (speaking to Luke):  "That's two you owe me, junior" [17:00].

The Clone Wars - S4E13 - "Escape from Kadavo"

13:35 - Zygerrian slaver:  "Keeper, a fleet of warships has dropped out of hyperspace in sector six."  One of the rebels says something similar in The Empire Strikes Back:  "General, there's a fleet of Star Destroyers coming out of hyperspace in sector four" [22:31].

13:46 - Plo Koon:  "Wolf leader to Wolf pack, accelerate to attack speed."  Red Leader also says, "Accelerate to attack speed" in A New Hope [1:45:56], and Lando says it in Return of the Jedi [1:35:19].

14:22 - Ahsoka:  "We'll need a bigger ship."  In Jaws, Chief Brody says something similar to Quint:  "You're gonna need a bigger boat" [1:21:24].

15:20:  Warthog (after Plo Koon shoots down two Zygerrians):  "Yeah!  That got 'em!"  Wedge has a similar exclamation in The Empire Strikes Back after one of the AT-ATs is blown up:  "Wooah!  That got him!" [29:24].

15:25 - Plo Koon:  "Watch out for those towers."  There's also some talk about towers in the attack on the Death Star in A New Hope. At 1:53:48, Wedge says, "My scope shows the tower, but I can't see the exhaust port. Are you sure the computer can hit it?" and then, "What about that tower?" to which Luke replies, "You worry about those fighters; I'll worry about the tower."

16:49 - Anakin:  "We are running out of time."  Qui-Gon also says this in The Phantom Menace:  "Either way, we're running out of time" [40:07].

17:55 - Anakin (after destroying the towers with gun emplacements):  "You're all clear, Master Plo."  Han Solo uses this same expression near the end of A New Hope:  "You're all clear, kid.  Now let's blow this thing and go home." [1:56:54]

The Clone Wars - S4E12 - "Slaves of the Republic"

0:38 -  This shot where the camera keeps pace with the Tecora as it passes other ships is similar to a shot of the Millennium Falcon in Return of the Jedi [1:26:55].

13:59 - Anakin salutes as a signal for R2 to launch his lightsaber to him, just like Luke does in Return of the Jedi [32:32].

The Clone Wars - S4E11 - "Kidnapped"

6:10 - There's a musical cue of the Imperial March as Anakin expresses his dislike of Zygerrian slave traders.

11:48 - Anakin (after Ahsoka asks how he knew that slicing a bomb with his lightsaber would disarm it):  "I trusted my instincts."  This is similar to what Qui-Gon tells him in The Phantom Menace:  "Feel, don't think; use your instincts" [57:47].

20:39:  Darts D'Nar:  "The Jedi will not stop us this time."  Vader uses the same expression in A New Hope:  "There'll be no one to stop us this time" [8:44].

21:05 - Ahsoka (after Yularen explains that the colonists on Kiros have vanished):  "Vanished?  That's impossible."  In The Empire Strikes Back, Luke also says, "That's impossible" [1:51:21].

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Some of the control panels in the Tecora have the same hexagonal pattern seen in the homestead garage in Attack of the Clones and A New Hope:

The Clone Wars - S4E10 - "Carnage of Krell"

11:25 - Krell:  "It's treason, then."  Palpatine also says this in Revenge of the Sith [1:11:22].

The Clone Wars - S4E9 - "Plan of Dissent"

4:05 - Jesse:  "The capital is too well armed."  During the conference on the Death Star in A New Hope, General Tagge* has a similar line:  "The Rebel Alliance is too well equipped" [37:02].

8:49 - Clone Trooper (to General Krell):  "Sir, there appears to be a disturbance in hangar nine four."  This seems to be a reference to the number of the Millennium Falcon's docking bay in A New Hope, although Han Solo and Obi-Wan Kenobi both pronounce it as one number ("ninety-four") [49:19].

8:54 - Krell:  "Trooper, what's going on down there?  Trooper?  Report, trooper."

Fives:  "Uh, yes, sir, everything's fine in the hangar, sir.  Nothing's out of control down here."

Krell:  "Then why have the alarms been triggered?"

Fives:  "Ah, uh, uh, uh, it's just a drill, uh, safety drill, sir."

Krell:  "Safety check occurs at 0600.  Who authorized this drill?"

Fives:  "Uh, we are decrypting the alien hardware, sir, standard operating procedure."

Krell:  "Who is this?  What's your CT number?  Trooper, identify yourself."

Elements of this (particularly Krell's last line) are reminiscent of the conversion that Han Solo has with an Imperial officer in A New Hope [1:15:17].

Han:  "Uh, everything's under control.  Situation normal."

Officer:  "What happened?"

Han:  "Uh, had a slight weapons malfunction, but, uh, everything's perfectly alright now.  We're fine.  We're all fine here now.  Thank you.  How are you?"

Officer:  "We're sending a squad up."

Han:  "Uh, uh, negative, negative.   We have, uh, a reactor leak here, uh, now.  Give us a few minutes to lock it down.  Uh, large leak, very dangerous."

Officer:  "Who is this?  What's your operating number?"

11:50 - Fives:  "General Skywalker blew up a droid control ship when he was just a kid, and he told me the trick is hitting their main reactor from the inside."  This may be an obvious reference, but I'll note it anyway:  Anakin's blowing up the droid control ship occurs near the end of The Phantom Menace. [2:02:32].

14:58 - Fives (upon seeing the space battle):  "Whoa!  What the?"  In Attack of the Clones, an alien on Coruscant makes this same exclamation as he sees Obi-Wan flying through traffic while hanging from a droid [15:08]; Han Solo says it in A New Hope after emerging from hyperspace into a meteor shower [1:03:15], and in Return of the Jedi, a scout trooper says this after being hit by Wicket [1:05:38].

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*It's spelt "Tagge" on the Star Wars website, but in the credits, it's "Taggi."

The Clone Wars - S4E8 - "The General"

6:17 - Hard Case (after the ground shakes):  "What the?"  In Attack of the Clones, an alien on Coruscant makes this same exclamation as he sees Obi-Wan flying through traffic while hanging from a droid [15:08]; Han Solo says it in A New Hope after emerging from hyperspace into a meteor shower [1:03:15], and in Return of the Jedi, a scout trooper says this after being hit by Wicket [1:05:38].

6:33 - Fives (to Hard Case, referring to the Umbaran tank):  "Blast it!"  Probably just coincidentally, Luke also yells this to Han in A New Hope (referring to the dianoga in the trash compactor):  "Blast it, will you!?" [1:20:38].  He also uses this expression simply to express frustration:  "Blast it!" after R2-D2 disappears [26:49] and "Blast it, Biggs, where are you?" when a TIE fighter is behind him during the Battle of Yavin [1:49:09].  This is also how Obi-Wan uses it in Attack of the Clones, when Jango Fett ambushes him:  "Blast!  This is why I hate flying!" [1:08:22].

8:26 - Fives:  "We're safe for the moment."  This line is similar to some dialogue in A New Hope.  Luke asks C-3PO, "Are you safe?" and he replies, "For the moment" [1:26:02].

15:58 - Hard Case:  "I prefer a good fight to all this sneakin' around."  Han Solo says almost the same thing in A New Hope:  "I prefer a straight fight to all this sneakin' around" [1:09:01].

20:22 - General Krell (after the clones have defeated the Umbaran tanks):  "Impressive."  Vader gives a similar compliment to Luke in The Empire Strikes Back:  "Impressive, most impressive" [1:44:30].

21:28 - Rex:  "A lot of men died to take this base."  Perhaps coincidentally, this is very similar to Mon Mothma's line "Many Bothans died to bring us this information" in Return of the Jedi [49:36].