I guess my earlier post didn't go through. One example I can think of off the top of my head is the DS explosion in ANH. It's at the disc-flip on the Def. Col., but the explosion continues after the screen goes black. On the Faces set, the explosion goes right into the next scene with Luke and Ben on the MF. This is one of the scenes I remember having to edit the audio to get it to sound similar to the Faces set. The other scene I can remember is when Vader walks out to the MF on the DS, right after it's been captured - there's about a half-second difference that had to be cut out.

Hey, what can I say? I was bored, and wanted to see (hear?) how well they lined up with each other....