The Clone Wars - S4E7 - "Darkness on Umbara"

0:19 - Narrator:  "As the Separatists tighten their grip over vital but isolated supply routes, the Republic launches a lightning strike into a remote, ghost nebula to control the strategic system of Umbara."  Leia uses this same expression in A New Hope:  "The more you tighten your grip, Tarkin, the more star systems will slip through your fingers" [57:44].

1:09 - Fives:  "Just like old times, Rex."  Biggs says almost the same thing in A New Hope:  "It'll be like old times, Luke" [1:43:34].

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Throughout this episode arc, Umbara is described as dark and shadowy.  The name Umbara seems to be derived from the Latin word umbra, which means shadow.

The Clone Wars - S4E6 - "Nomad Droids"

The fortune cookie is "Who's the more foolish, the fool or the fool who follows him?" which Obi-Wan says in A New Hope [1:07:29].

1:31 and 4:31 - C-3PO (to R2):  "Did you hear that?"  He also asks him this in A New Hope [2:47].  The first instance in this episode occurs while they're going down the hallway and the ship is under attack, and these circumstances also mirror those in A New Hope.

2:55 - C-3PO:  "R2, do something!  Get us out of here!"  Han Solo also says this to Chewbacca in A New Hope:  "Chewie, get us outta here!" [55:26].

6:25 - The Big Hay-Zu:  "So, you are the intruders."

C-3PO:  "Intruders, oh, hardly, your worshipfulness."

Han calls Leia "worshipfulness" in A New Hope ("Look, your worshipfulness, let's get one thing straight:  I take orders from just one person:  me!" [1:26:04]), and C-3PO calls Jabba "worshipfulness" in Return of the Jedi ("I am here, your worshipfulness" [15:02]).

9:36 - C-3PO (in response to R2's beeps):  "I heartily agree."  He uses the same expression in A New Hope after Luke suggests he wait outside by the speeder and says they want to avoid trouble in the cantina:  "I heartily agree with you, sir" [45:45].

15:43 - C-3PO:  "It's all your fault, R2, all your fault."  He places the blame on R2 twice in A New Hope too:  "I don't know what all this trouble is about, but I'm sure it must be your fault" [52:03] and "This is all your fault" [1:36:11] (when 3PO is tangled in wires in the Millennium Falcon).  He also blames himself when he thinks that Luke, Leia, Han, and Chewbacca are dying in the trash compactor:  "It's all my fault!" [1:24:42].

18:18 - C-3PO:  "Goodness gracious me!"  He also uses this expression in Return of the Jedi, at the door of Jabba's palace [5:52].

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The pit droids' deception of projecting a hologram image of a leader amid smoke and lightning is similar to what the wizard does in The Wizard of Oz.

The Clone Wars - S4E5 - "Mercy Mission"

The title comes from A New Hope, where Darth Vader says to Leia, "You weren't on any mercy mission this time" [7:47].

6:50 - Sinker:  "Comin' here was a bad idea."

Boost:  "I'm beginnin' to agree with ya."

In The Empire Strikes Back, Luke has the same response to R2's beeps:  "If you're sayin' comin' here was a bad idea, I'm beginnin' to agree with ya" [43:55].

8:38 - C-3PO:  "Impossible clones!"  He similarly describes Han Solo in The Empire Strikes Back:  "Impossible man" [7:40].

10:00 - C-3PO:  "I have a bad feeling about this."

10:21 - C-3PO - "I suppose that could have been worse" and after rubble traps him and R2, "Now it is."  In A New Hope, there's a similar exchange in the trash compactor.  Leia says to Han, "It could be worse," and after an unsettling noise, he replies, "It's worse" [1:19:41].

12:04 - C-3PO (to R2 as bugs fly around him):  "Did you see that?"  Perhaps coincidentally, he asks a similar question (also to R2) at the beginning of A New Hope:  "Did you hear that?" [2:47].

12:39 - C-3PO (in response to a tree saying he does not belong):  "I heartily agree; being here is a terrible mistake."  He uses the same expression in A New Hope after Luke suggests he wait outside by the speeder and says they want to avoid trouble in the cantina:  "I heartily agree with you, sir" [45:45].

17:01 - C-3PO:  "R2, we're doomed."  He also says "We're doomed" twice (both times to R2) in A New Hope [3:04, 16:02], once (to Han, Leia, and Chewbacca) in The Empire Strikes Back [1:00:38], and once (to R2) in Return of the Jedi [10:03].

17:47 - C-3PO:  "Riddles are my specialty."  He pronounces "specialty" with five syllables, just like Obi-Wan does in Revenge of the Sith when he tells Palpatine, "Sith Lords are our specialty" [12:14].

The Clone Wars - S4E4 - "Shadow Warrior"

3:05 - Padmé (to Boss Lyonie):  "With all due respect, your course of action is based on lies."  In The Phantom Menace, Qui-Gon and Obi-Wan's pilot also says, "With all due respect" ("With all due respect, the ambassadors for the Supreme Chancellor wish to board immediately" [2:06]), and Obi-Wan uses it in Revenge of the Sith while speaking to Mace Windu about Anakin ("With all due respect, Master, is he not the chosen one?" [40:32]).  As Queen Amidala, Padmé also uses the phrase "course of action" in The Phantom Menace:  "I will not condone a course of action that will lead us to war" [9:51].