4:51 - Kanan: "Let's go take a look." Referring to sand people, Luke says nearly the same thing to C-3PO in A New Hope: "Come on; let's go have a look" [28:39]
9:43 - Rex (to Saw): "It's good to see you alive, my old friend." The phrase "old friend" is also used in Attack of the Clones (where Palpatine suggests "an old friend, like Master Kenobi" to protect Padmé [6:34] and Count Dooku calls Mace Windu "my old Jedi friend" [1:50:24] and just "old friend" [1:56:05]), in Revenge of the Sith (where Obi-Wan says, "Goodbye, old friend" to Anakin as he leaves for Utapau [51:13] and Yoda refers to Qui-Gon as "an old friend" [2:09:56]), in A New Hope (where Leia sarcastically says, "We, uh, ran into some old friends" when Han asks her and Luke where they've been [1:31:33]), in The Empire Strikes Back (where Yoda says that through the Force, Luke will see "Old friends long gone" [1:17:05]), and in Return of the Jedi (where Luke says, "I have a promise to keep to an old friend" [37:37] and Han calls C-3PO "an old friend of mine" [1:11:53]).
10:36 - Sabine (upon realizing that the energy source is a shield generator): "Oh, I don't believe it!" Luke also says, "I don't, I don't believe it" in The Empire Strikes Back, after Yoda uses the Force to get his X-wing out of the swamp [1:13:10].
10:50 - Sabine (about the shield generator): "Looks like it's fully operational." In Return of the Jedi, Palpatine uses the same words to describe the Death Star when he tells Luke, "Now witness the firepower of this fully armed and operational battle station!" [1:41:27]
11:23 - Zeb "You don't just find a fully operational shield generator on a deserted planet for no reason." See above, 10:50.
14:50 - Hera (about the destroyer droids): "There's too many, Zeb." A rebel pilot says the same thing in Return of the Jedi (referring to TIE fighters): "There's too many of them" [1:35:13].
15:40 - Hera (to the team in the catacombs): "Alright, boys, I'm calling it; get back to the surface before these battle droids or anything else wakes up." Luke also says, "Alright, boys" as the snowspeeders join the battle in The Empire Strikes Back: "Alright, boys, keep tight now" [26:38].
15:48 - Saw: "We're not going anywhere." Initially refusing to rescue Leia, Han says the same thing in A New Hope: "I'm not goin' anywhere" [1:11:14].
16:32 - Kanan: "Sabine and Zeb are in trouble." Han says, "We're in trouble" after the Millennium Falcon fails to jump to hyperspace in The Empire Strikes Back [37:54].
17:56 - Rex (after Kanan tells him and Saw to blast a bridge loose): "I think I know what you have in mind." Han says basically the same thing in A New Hope: "Don't worry, Chewie; I think I know what he [Luke] has in mind" [1:12:12], and in The Empire Strikes Back, Leia uses the same expression when she asks Han, "What'd you have in mind for your next move?" [1:14:52].