Continuity mistake: In the first BTTF movie, when Lorraine and Marty are sitting in the car, Lorraine takes off her coat and then asks Marty why he's so nervous. In this movie, when Marty is crouching down to get past the car, Lorraine looks at 1955 Marty and asks him why he's so nervous without taking off her coat.
Back to the Future Part II (1989)
Plot summary
Directed by: Robert Zemeckis
Starring: Christopher Lloyd, Michael J. Fox, Lea Thompson, Thomas F. Wilson, Elizabeth Shue
Dr. Emmett Brown takes Marty and Jennifer to the future to help their kids not to ruin their lives.
After doing that, Marty buys a sports almanac for 1950-2000, thinking it might help him in his time. Doc finds out and throws it away, but the 2015's Biff (very old now) finds it and uses the DeLorean to give the almanac to the young himself.
When Marty and Jennifer arrive back to their own time, they find it totally different - Biff is very rich, he practically owns the city, he married Marty's mom, killed his dad, and when Marty starts to ask about the almanac, he wants to kill him too.
Doc also finds out that he was imprisoned as a lunatic, so the two go back to 1955, the night of the Enchantment-Under-The-Sea party to take back the almanac.
More mistakes in Back to the Future Part II
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.
More trivia for Back to the Future Part IIMore questions & answers from Back to the Future Part II
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Answer: He is attempting to play the song "The Power Of Love" by Huey Lewis and The News. He was first seen playing it very well in the first Back To The Future movie when he was trying out for the school dance. Jennifer recognizes the song and is shocked that Marty who was so good at guitar was suddenly able to hardly play it.