Audio problem: When Philippe climbs up to the grating in the church, a little girl talks to him, but her mouth does not move.
Audio problem: Lorraine comes to see Marty in Doc's garage in 1955 to ask him if he will go to the dance with her. Just before Lorraine moves to the other side of the car from where she walked in, she begins to say something to Marty. The problem is that her lips don't move when she talks, I guess the right clip ended up on the editing room floor. (01:11:40)
Audio problem: When Ben and the rest of his friends are "out on the town", he starts his car to go home, but when he does it makes the distinct sound of an older Chrysler when he was driving a Cadillac.
Audio problem: When Nicholas casts the spell to make the kids fight, Tender Heart says "Nicholas what have you done?" His mouth is closed when he says "Nicholas."
Audio problem: At the end of the movie, after Manny has disconnected the locomotive from the rest of the train which is slowing down, when it stops we can hear it screech. It shouldn't as the train slows down naturally without the help of the breaks, which additionally, as it had been mentioned (by the woman), are not working. (01:45:30)