Continuity mistake: In the beginning when Doc takes Marty and Jennifer to 2015 for the first time, they are descending towards Hill Valley. Doc turns the steering wheel to the left but the car goes right and down. (00:05:53)
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...
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.
Trivia: When Doc and Marty arrive back in 1955 to stop the handover of the Almanac, there are 4 versions of the time machine in the area at that time - the one they just arrived in from the alternate 1985, the one Marty arrived in from the original 1985 in the first film, the one Biff arrived in from 2015 in the second film, and the one Doc buried in 1885 in the third film.
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