Rebels - S2E19 - "The Forgotten Droid"

There's some slight significance in the composition of a particular shot in "The Forgotten Droid."

Near the beginning of the episode, Chopper abandons The Ghost to steal a leg that would replace his mismatched one and then escapes aboard an Imperial freighter.  Later, he contacts Hera, who's angry about his disobedience.  After she says, "Really?  So you didn't leave The Ghost to go after that leg?" he appears a bit ashamed (doing what is apparently the droid equivalent of scratching his head in an act of discomfort, unwilling to admit the truth).  In this shot, the leg is looming behind him, almost as if weighing on his shoulder in a picture of his guilt:

Rebels - S2E19 - "The Forgotten Droid"

5:24 - The symbol on the door inside the Imperial ship also appears in Echo Base in The Empire Strikes Back [33:36]:

5:54 - AP-5:  "It is against my programming protocol to allow this Imperial vessel or its cargo to be late for its scheduled deliveries."  C-3PO encounters a similar limit in Return of the Jedi, as he tells Han:  "It's against my programming to impersonate a deity" [1:11:37].

6:18 - Stormtrooper (to Imperial captain):  "Sir, we've begun a search.  If any rebels got on board, we'll find them."  In The Phantom Menace, a battle droid's comment has a similar construction; referring to the Jedi, it tells Nute Gunray and Rune Haako, "If they're down here, sir, we'll find them" [10:39].

8:12 - AP-5 (to Chopper):  "You can run, but there will be no escape."  Vader says nearly the same thing to Luke in The Empire Strikes Back:  "There is no escape" [1:50:25].  Palpatine also tells Luke, "There is no escape" in Return of the Jedi [1:44:31].

11:36 - Imperial captain (after Chopper hits him):  "Ow!  What the?"  In Attack of the Clones, an alien on Coruscant also exclaims, "What the?" as he sees Obi-Wan flying through traffic while hanging from a droid [15:08]; Han 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].

12:05 - AP-5 (to Chopper after he attacks the captain):  "I can't believe what you just did."  Dr. Jones, Sr. also says this in The Last Crusade after Indy shoots down some Nazis:  "I can't believe what you did" [51:29].

16:30 - Ketsu (after Sabine thanks her):  "You owe me one."  Anakin also says this to Obi-Wan in Revenge of the Sith:  "Alright, but you owe me one, and not for saving your skin for the tenth time" [24:38].  In Return of the Jedi, Han also tells Luke, "I owe you one" [37:21].

16:47 - Screenshots don't do this justice, but this shot of The Ghost sliding to a stop as it approaches the camera is similar to one of the Separatist vessel doing the same near the beginning of Revenge of the Sith [23:23].