There are several lines missing since the very first home video releases, though only lines coming from off-screen, so I didn't know about them until recently, because the German Blu-rays reinserted them for the very first time.

The lines are:

HAN: Seems okay, if we can get to it.
+
LUKE:Look! (both when the gang tries to escape from the DS)

LEIA: They're tracking us! (unfortunately this one is still missing, even from the Blu-ray)

LUKE: You know what's about to happen, what they're up against.
+
LUKE: Well, take care of yourself, Han.

The sentences around these lines were always kinda weird in the German version, but the fixed ones now make much more sense.

Also these lines of dialogue by Han and Luke disguised as stormtroopers are missing from some German mixes (the pre-THX ones, I think):

LUKE: I can't see a thing in this helmet.
+
HAN: This is not going to work.
LUKE: Why didn't you say so before?
HAN: I did say so before!