While not exactly a change "That Nobody Talks About" (More something that isn't talked about / cared about enough)...
...is the opening Logos. To me, it just isn't Star Wars if it doesn't start with the beautiful original hand painted Fox logo and the clean crisp green of the original Lucasfilm logo (That stylistically matches the simple blue of the "far, Far, away" titles). Presenting Star Wars with the ersatz CGI logo(s) and overly showy new Lucasfilm logo is a total disconnect in film styles. They are films from the late70s/early80s so they need to have titles that match frm that era.
It's really important to me and not having them will slightly spoil ESB:R inevitably... I'm sure my disappointment will be swiftly overcome though ;-)
^ Mmmm, a thing of beauty.
^ An abomination unto my eyes! and I don't want the name of Murdoch's other Evil Empire polluting the image.