Continuity mistake: When Marty arrives in 1955, he lands on Peabody's farm and rams through the pine tree he then hits a scarecrow which flies over the top of his car. Then as they show it from the inside the scarecrow slams into the windshield - but how can it slam into his windshield if it is already over the car? (00:31:30)
Continuity mistake: Lisa is trying to convince Gary's parents to let him go to the party. There is a glass of beer on the table. The camera switches to a close up and then back to a wide shot and the beer is gone. (00:37:49 - 00:39:10)
Continuity mistake: When Tina runs up the stairs and then falls through, she lands on a blanket but when she stands up, the blanket is gone.
Continuity mistake: When the SR-71 is taxiing from the hanger its tail number is 17964, but just before the plane explodes the tail number is 17974. (01:25:15 - 01:31:30)