From the excellent dvdanswers•com (aka dvdactive•com) website, an exhaustive list of many (if not all) of the changes made to the differing versions of the Original Trilogy films over time…

^ exhaustively compiled and put together by OT•com member Mentasm, in his thread, here:-

I’m doing a comparison - opinions please!

Jay or Zion - Would it be worth pinning this at the top of this forum as to not lose it over time?

Mod Edit: Unfortunately many of the websites linked to in this thread no longer around. However, thanks to the Internet Archive’s WayBack Machine… the links have been edited to now function - as of the last time time the featured websites were operational / still accessible…