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)
Ending / spoiler
Directed by: Robert Zemeckis
Starring: Christopher Lloyd, Michael J. Fox, Lea Thompson, Thomas F. Wilson, Elizabeth Shue
After causing Biff to crash into (another) manure truck, Marty finally recovers the sports almanac from Young Biff in 1955 and burns it, restoring the timeline to its proper state. The DeLorean, which is flying overhead, is struck by lightning, sending it and the Doc through time. Thanks to the Doc's hind/foresight, he sends a telegram ahead to Marty's exact location and time, assuring him of his safety in his new location--1885! Marty immediately heads to where the 1955 Doc has sent himself (Marty) into the present (remember that this happened in the first movie), and tells him that he's "back from the future". The shock is too much for the scientist, and with a "Great Scott!", he passes out. To be concluded...
Artp
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.
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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.