I've always been curious about this. I rewatched the old trilogy last week and it reminded me that i never really found out the answer to this. Why does Luke tell R2 "You were lucky to get out of there" in Empire, instead of the original "You're lucky you don't taste very good." Or Han, in Jedi telling Lando "It's alright, I can see a lot better" instead of the original, "It's allright, trust me." And then they added little things like Luke thanking 3po in Empire, when 3po expresses seeing Luke in one piece. I vaguely remember reading somewhere that these lines fit the lip syncing better than the old lines, but in the case of Luke thanking 3po, or 3po adding the line "There's nowhere to go" in the astroid field, we don't see a visual reference. Does anyone know what reasons that had for changing these? I rather liked "You're lucky you don't taste very good."