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Mistakes
In Biff's apartment in alternate 1985 while Biff and Lorraine are arguing he knocks her to the ground and both her shoes come off. After Biff punches Marty in the stomach it then switches again to show Lorraine's reaction. As it does this we see her on the floor but her shoes are back on her feet. She could have had enough time to put them back on possibly but it seems unlikely that she would have done so as she is laying in the same position as when she was knocked down. See more...
Trivia
When young Jennifer is in her future house, her daughter-to-be, Marlene, comes down the stairs. Marlene says, "Mom? Mom, is that you?" - the same quote used by Marty three times throughout the trilogy when he wakes up in bed, after being knocked out. See more...
Back to the Future Part II (1989) - 15 quotes
Directed by Robert Zemeckis, starring Christopher Lloyd, Elizabeth Shue, Lea Thompson, Michael J. Fox, Thomas F. Wilson (add more)
Biff: Look, Lorraine, you walk out that door and I won't only cut off you, I'll cut off your kids.
Lorraine: You wouldn't!?
Biff: Oh, wouldn't I? First your daughter, Linda. I'll cancel all her credit cards. She can settle her debts with the bank all by herself. Your idiot son, Dave. I'll get his probation revoked. And as for Marty. Well, maybe you liked to have all three of your kids behind bars just like your brother Joey. One big happy jailbird family.
Data: Hey McFly, you bojo, those boards don't work on water!
Whitey: Unless you've got POWER!
Red the Bum: Crazy drunk pedestrians!
Doc: Roads? Where we're going, we don't need roads.
Marty: I don't get it, Doc. I mean, how can all this be happening? It's like we're in Hell or something.
Doc: No, it's Hill Valley. Although I can't imagine Hell being much worse!
Lorraine: Biff Tannen, I wouldn't be your girl even if...even if you had a million dollars.
Doc: Marty! What in the name of Sir Isaac H. Newton happened here?
Biff: Oh! Nice dress, Lorraine. Although, I think you'd look better wearing nothing at all.
Lorraine: Biff, why don't you take a long walk off a short pier?
Biff: Hey listen, Lorraine. Now that I got my car all fixed up I figured I cut you a break and give you the honor of going with the best looking guy in school.
Lorraine: Yeah, well, I'm busy.
Biff: Oh, yeah? Doing what?
Lorraine: Washing my hair.
Biff: Oh, that's about as funny as a screen door on a battleship.
Marty: Screen door on a submarine, you dork.
Doc: The time-traveling is just too dangerous. Better that I devote myself to study the other great mystery of the universe...women!
Young Biff: Manure! I HATE manure!
Old Biff: I have a little something for you. You do want to be rich, don't you?
Young Biff: Oh, yeah. Sure. That's rich. You're gonna make me rich.
Old Biff: You see this book? This book tells the future. It tells the outcome of every major sports event 'til the end of the century. Football, baseball, horse races, boxing. The information in here is worth millions, and I'm giving it to you.
Young Biff: That's very nice. Thank you very much. Now why don't you make like a tree, and get out of here?
Old Biff: It's LEAVE, you idiot! "Make like a tree and leave." You sound like a damn fool when you say it wrong!
Marty: Nobody calls me chicken.
Marty: That's right, Doc. November 12, 1955.
Doc: Unbelievable, that old Biff could have chosen that particular date. It could mean that that point in time inherently contains some sort of cosmic significance. Almost as if it were the junction point for the entire space-time continuum. On the other hand, it could just be an amazing coincidence.