Jaws: I have the 30th anniv DVD, BD and 1992 "rescored music" credit WS LD. Someone once said in a review that they thought the climactic line may have been remixed on the LD along with the different music additions. I've personally checked and the music is different, but haven't checked the final line before.
As I understood it, Uni was too cheap to pay music licensing and would re-score source cues and potentially remix the audio. The 1995 signature LD restored the original music and should be the original mono in PCM. I figured the DVD was a lossy port of this, and the BD a slightly higher res copy.