2:59 - This shot of an Imperial shuttle entering a landing bay in the second Death Star has the same general framing as the Millennium Falcon entering a landing bay in the first Death Star in A New Hope [1:05:31]:
8:04 - C-3PO: "R2, I have a bad feeling about this."
11:21 - C-3PO (to EV-9D9): "I am C-3PO, human-cy-." That's as far as he gets before being interrupted, but he introduces himself the same way to Luke in A New Hope ("And I am C-3PO, human-cyborg relations" [20:25]) and to Lando in The Empire Strikes Back ("I am C-3PO, human-cyborg relations" [1:21:31]).
21:55 - Han: "I'm out of it for a little while, everybody gets delusions of grandeur." C-3PO also uses this phrase in The Empire Strikes Back when he tells R2-D2: "I'm standing here in pieces, and you're having delusions of grandeur" [1:59:01].
28:48 - C-3PO: "His high exaltedness, the great Jabba the Hutt has decreed that you are to be terminated immediately." Referring to Leia, Tarkin gives the same command in A New Hope: "Terminate her immediately" [1:03:05].
30:49 - C-3PO (after he runs into R2-D2 serving drinks on Jabba's sail barge): "I'm terribly sorry." He uses the same expression in The Empire Strikes Back, apologizing to Lando about Chewbacca: "I'm terribly sorry about all this, after all, he's only a Wookiee" [1:42:41].
32:58 - Wilhelm scream (one of Jabba's guards as he falls into the Sarlacc pit)
37:37 - Luke: "I have a promise to keep, to an old friend." The phrase "old friend" is also used in A New Hope (Leia sarcastically says, "We, uh, ran into some old friends" when Han asks her and Luke where they've been [1:31:33]) and in The Empire Strikes Back (Yoda says that through the Force, Luke will see "Old friends long gone" [1:17:05]).
38:57 - Emperor Palpatine (to Vader): "Patience, my friend." In The Empire Strikes Back, Yoda and Obi-Wan also counsel Luke with, "Patience!" [Yoda at 54:36 and 55:03; Obi-Wan at 1:24:18].
39:16 - Vader (after Palpatine explains his plan to turn Luke to the dark side): "As you wish." In A New Hope, Vader says this after Tarkin asks him to release General Motti from his Force choke [38:45], and in The Empire Strikes Back, Boba Fett says it after Vader warns the bounty hunters against disintegrations [1:06:22].
43:02 - Yoda (to Luke): "Remember: a Jedi's strength flows from the Force." He also tells him this in The Empire Strikes Back: "A Jedi's strength flows from the Force" [1:01:18], and it's similar to what Obi-Wan tells him in A New Hope: "Remember, a Jedi can feel the Force flowing through him" [1:00:50].
43:21 - Yoda (to Luke): "Once you start down the dark path, forever will it dominate your destiny." He says nearly the same thing (also to Luke) in The Empire Strikes Back: "If once you start down the dark path, forever will it dominate your destiny; consume you it will!" [1:01:31].
46:00 - Luke: "Why didn't you tell me? You told me Vader betrayed and murdered my father."
Obi-Wan: "Your father was seduced by the dark side of the Force."
Some of these phrases exactly echo what Obi-Wan tells Luke in A New Hope: "A young Jedi named Darth Vader, who was a pupil of mine until he turned to evil, helped the Empire hunt down and destroy the Jedi knights. He betrayed and murdered your father. Now the Jedi are all but extinct. Vader was seduced by the dark side of the Force." [34:13].
47:24 - Obi-Wan (to Luke): "You were our only hope." 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]), and 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]).
53:02 - Han (referring to the stolen Imperial shuttle): "Chewie, let's see what this piece of junk can do." This is also how Luke describes the Millennium Falcon when he first sees it in A New Hope: "What a piece of junk!" [54:37].
53:57 - Vader (to Palpatine): "What of the reports of the rebel fleet massing near Sullust?" In A New Hope, General Tagge asks Tarkin a question with the same construction: "And what of the rebellion?" [37:42].
54:04 - Emperor Palpatine: "Soon the rebellion will be crushed, and young Skywalker will be one of us." Tarkin uses a similar expression in A New Hope: "Now Lord Vader will provide us with the location of the rebel fortress by the time this station is operational; we will then crush the rebellion with one swift stroke" [38:52].
56:13 - Admiral Piett (to Vader): "As you wish, my lord." See above, 39:16.
1:05:38 - Scout trooper (after Wicket hits him with a stick): "What the?" Han Solo says this in A New Hope after emerging from hyperspace into a meteor shower [1:03:15].
1:07:38 - Vader (after Palpatine commands him to bring Luke to him): "As you wish." See above, 39:16.
1:11:53 - Han (to the Ewoks, referring to C-3PO): "He's an old friend of mine." As noted above, Leia uses the phrase "old friend" in A New Hope and Yoda uses it in The Empire Strikes Back.
1:12:40 - Han: "I have a really bad feeling about this."
1:33:51 - Imperial officer: "You rebel scum." In The Empire Strikes Back, Admiral Piett gives the same appraisal: "Bounty hunters!? We don't need their scum." [1:05:52]
1:34:20 - Wedge: "Lock S-foils in attack positions." Red Leader gives the same instruction in A New Hope: "Lock S-foils in attack position" [1:45:38].
1:34:48 - Lando: "Pull up! All craft, pull up!" Biggs gives this instruction to Luke and to Porkins in A New Hope ("Luke, pull up!" [1:46:42] and "Pull up!" [1:47:22]).
1:35:03 - Admiral Ackbar: "It's a trap!" Leia says this twice in The Empire Strikes Back: "Luke, don't; it's a trap! It's a trap!" [1:39:49].
1:37:06 - C-3PO (to the Imperial troops): "Were you looking for me?" This might be a reference to Obi-Wan's "These aren't the droids you're looking for" in A New Hope [43:40].
1:44:16 - Rebel pilot: "I'm hit!" In A New Hope, this is said by a Rebel pilot ("I'm hit!" [1:48:06]), Luke ("I'm hit, but not bad" [1:48:48]), and Wedge ("I'm hit!" [1:54:32]).
1:44:31 - Palpatine (to Luke): "There is no escape." Vader also tells Luke this in The Empire Strikes Back [1:50:25].
1:48:03 - Han: "I love you."
Leia: "I know."
With reversed speakers, this exchange also occurs in The Empire Strikes Back [1:35:54]. Both scenes also have similar musical cues.
1:49:01 - Vader (to Luke): "Obi-Wan has taught you well." He also says this to Luke in The Empire Strikes Back [1:44:42].