New section here! Let's begin with one of my all time favourites!
Have you ever noticed this? I really haven't, and I watched this film hundreds of times...
Did you know that the final scene of BTTF1 and the beginning of BTTF2 are NOT the same scene? It was re-shot. Here you got a comparison, you can notice the small differences. Even the actress playing Jennifer is different!
Bonus: This will surely crack you up if you're spanish speaker. Michael J. Fox is impersonating a chicano here, insulting in spanish. ("Eh, puto!!", meaning "Hey, fucker!!").