0:18 - Woman in the hologram: "We had no idea the rebels were so well equipped." There's some resemblance between this and what General Tagge says in A New Hope: "The rebel alliance is too well-equipped" [37:02].
3:58 - Sabine (after the Imperial officer questions her credentials): "That, um, that happens from time to time." C-3PO uses this same expression in The Empire Strikes Back when he tells Leia, "Actually, R2 has been known to make mistakes from time to time" [12:31].
4:42 - Kanan (to Ezra, about Sabine): "Don't worry; she'll be fine." See above, 0:13.
5:56 - Instructor Goran: "Comscan is tracking rebel ships entering sector two." General Veers also mentions Comscan in The Empire Strikes Back when he tells Vader, "Comscan has detected an energy field protecting an area of the sixth planet of the Hoth system" [23:01].
6:03 - Sabine: "Right behind ya, two five." Jek Porkins says something similar (to Biggs) in A New Hope: "I'm right with ya, Red Three" [1:47:11].
10:22 - Sabine (to Wedge): "Look, I want to do my part for the Empire, but firing on unarmed ships wasn't what I had in mind." Han uses this expression in A New Hope: "Don't worry, Chewie; I think I know what he [Luke] has in mind" [1:12:12]. In The Empire Strikes Back, Leia also asks Han, ""What'd you have in mind for your next move?" [1:14:52].
10:50 - Wedge (after Sabine hints at defection): "What are you talkin' about?" This line appears three times in A New Hope: twice, C-3PO asks R2-D2, "What are you talking about?" [6:51 and 9:47], and later, in response to Luke's urge to rescue Leia, Han asks, "What are you talkin' about?" [1:11:03]. In Attack of the Clones, Anakin also asks Padmé, "What are you talking about?" [1:43:07].
11:08 - Wedge: "What's your plan?" In A New Hope, Han asks Luke the same thing [1:11:56].
12:03 - Instructor Goran (to Governor Pryce): "With all due respect, Governor, I am trying to train pilots here." 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]).
14:41 - Instructor Goran: "Four cadets have broken off from the main group toward the rebel ship." Vader uses the same expression in A New Hope, when he tells two pilots, "Several fighters have broken off from the main group" [1:48:30].
16:39 - Wedge (after he unwittingly gives the Imperials Sabine's name): "Blast it!" 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]).
17:33 - Hobbie (to Wedge): "So what's your plan?" See above, 11:08.
17:51 - Governor Pryce (after Sabine compliments her fighting): "The Empire taught me well." Vader tells Luke, "Obi-Wan has taught you well" in The Empire Strikes Back [1:44:42] and in Return of the Jedi [1:49:01].
18:40 - Agent Kallus (to Sabine): "Don't shoot." C-3PO says this to Jawas in A New Hope: "Don't shoot! Don't shoot!" [16:27].