And during the commentary with Bob Gale for Part II, he mentions that the picture of Buford included in the movie of Biff's life at the Biff Tannen Museum (this is in the alternate 1985 where Biff is a rich bastard) doesn't match the look of Buford seen in Part III. This is because they hadn't figured out what Buford would like when filming Part II. But Bob then goes on to say that he could change it and make the two versions of Buford match, but he says that he doesn't believe in doing that.

I just thought it would be interesting to share here.

And I've been re-watching the BTTF trilogy, since I just got back my replacement discs of Parts II and III, since the original discs weren't framed correctly. They wouldn't show visual gags like the auto-fitting jacket seen in 2015 in Part II.