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)
Continuity mistake: When Cain and West are in the morgue trying to re-animate the cadaver, a phone rings outside at the security desk and when we see it, the buttons are facing outward, but when Megan goes down to the security desk, we see the phone is now turned completely around. (00:49:32 - 00:56:54)