The Biff dying one would make sense to reinstate, as would the Marshal Strickland's death scene, and possibly the one when Doc bribes the cop, but I think this one in particular could stay omitted, as Doc's character in this (he has a playboy magazine) goes against what we see in Part III when he has absolutely no idea what to do with Clara and is a bit like a child exploring something new, which wouldn't really work with a scene in Part I that shows he reads p**nographic magazines
EDIT: wow autocensor