5:26 - Rex (to the rebels): "Sorry about the, um, weapons malfunction." This is the same excuse Han gives to an Imperial officer in A New Hope: "Uh, had a slight weapons malfunction" [1:15:21].
11:16 - Zeb (after Gregor says they're coming up on a hot spot): "Your hot spot looks like everywhere else on this desolate rock." Luke uses a similar expression in A New Hope; after C-3PO asks if there's anything he can do to help, he replies, "Not unless you can alter time, speed up the harvest, or teleport me off this rock" [19:58].
12:35 - The joopa makes the same sound as the sarlacc in Return of the Jedi.
17:03 - Hera (to Kanan): "Ahsoka's always full of surprises." Luke uses the same expression during his duel with Vader in The Empire Strikes Back: "You'll find I'm full of surprises" [1:43:49].