The Clone Wars - S2E21 - "R2 Come Home"

11:31 - Anakin (to Mace Windu, about using the Force to move the wreckage they're trapped in):  "I already tried that."  In A New Hope, Luke says something similar to Han when he tries to shoot his way out of the trash compactor on the Death Star:  "Will you forget it!  I already tried it; it's magnetically sealed!" [1:19:29].

The Clone Wars - S2E20 - "Death Trap"

1:50 - Boba Fett (posing as a clone cadet, when asked what outfit he's from): "327nd."

2:28 - Jax:  "And with the training we got, I feel ready for anything."  In A New Hope, before entering the cantina, Luke tells Obi-Wan, "I'm ready for anything" [44:38].

3:49 - Unidentified clone cadet (about the prospect of serving alongside two Jedi Knights):  "That's wizard!"  Anakin's friend Kitster uses the same expression in The Phantom Menace:  "This is so wizard, Ani!" [54:25].

6:39 - Sgt. Crasher:  "Alright, alright, cut the chatter, men."   Red Leader uses this same expression in A New Hope:  "Cut the chatter, Red Two" [1:45:55].

9:13 - Sgt. Crasher (to Boba):  "Cadet 327, what reaction propels the main engines of this Jedi cruiser?"

14:23 - Wilhelm scream (clone trooper)

20:12 - Aurra Sing (urging Boba to jettison the escape pod of clone cadets):  "Do it!"  In Revenge of the Sith, Palpatine says this to Anakin, telling him to kill Dooku [14:22].

The Clone Wars - S2E19 - "The Zillo Beast Strikes Back"

The title of this episode is a nod to that of The Empire Strikes Back.

14:47 - C-3PO:  "We're doomed."  He also says this twice in A New Hope [3:04, 16:02], once in The Empire Strikes Back [1:00:38], and once in Return of the Jedi [10:03].

15:32 - Palpatine:  "I've got a bad feeling about this."

16:31 - Anakin:  "Here's where the fun begins."  Han Solo says this in A New Hope [56:26], and Anakin has a similar line in Revenge of the Sith:  "This is where the fun begins" [3:48].

The Clone Wars - S2E18 - "The Zillo Beast"

1:46 - Chancellor Palpatine:  "This bomb is our only hope for victory now."  Leia uses the phrase "only hope" twice in A New Hope ("Help me, Obi-Wan Kenobi; you're my only hope" [35:35] and "You must use the information in this R2 unit to help plan the attack; it's our only hope" [1:38:49]); C-3PO uses it once in The Empire Strikes Back ("Your highness, we must take this last transport; it's our only hope" [31:49]); Obi-Wan uses it once, referring to Luke, in Return of the Jedi ("You were our only hope" [47:24]); and Luke uses it once, referring to Leia, in Return of the Jedi ("If I don't make it back, you're the only hope for the Alliance" [1:19:39]). Sio Bibble also uses it in The Phantom Menace: "Our only hope is for the senate to side with us" [23:48].

8:47 - Mace Windu:  "I have a bad feeling about this."

9:42 - Wilhelm scream (clone trooper)

10:01 - Mace Windu (to clone troopers as Anakin distracts the Zillo Beast):  "Now's our chance; let's go!"  Han Solo has a similar line in A New Hope, when the lightsaber duel between Darth Vader and Obi-Wan Kenobi distracts the stormtroopers on the Death Star:  "Now's our chance; go!" [1:32:02].

The Clone Wars - S2E17 - "Bounty Hunters"

16:26 - Hondo:  "But you know what I always say:  speak softly and drive a big tank."  This seems to be patterned after Theodore Roosevelt's "Speak softly and carry a big stick."

18:37 - Hondo:  "Die, Jedi scum!"  C-3PO (with his head on the body of a battle droid) has a similar line in Attack of the Clones:  "Die, Jedi dogs!" [1:53:27].  Insults involving scum also appear in Revenge of the Sith (General Grievous calls Anakin "Jedi scum" [19:12]), The Empire Strikes Back (Admiral Piett remarks, "Bounty hunters!?  We don't need their scum." [1:05:52]), and Return of the Jedi (an Imperial officer says, "You rebel scum" [1:33:51]).