Continuity mistake: When the Sheriff inspects the damaged window the second bullet hole is gone. (00:33:50)
Continuity mistake: After the car crashes through the gate and Jack and Marty jump out it finally goes down a cliff. The dent from the crash is gone when the car is flying though the air. (00:53:55)
Continuity mistake: When the car falls off the cliff you see that the passenger airbag is blown up. In the next shot from the side there is no airbag. (00:53:55)
Continuity mistake: When Marty talks to Cindy in her bed her bangs differ in close up and wide shots. (01:03:15)
Continuity mistake: When Cindy's jeep crashes into the mine building it is shown in three shots. In the first two the jeep bursts though the right side of the gate, in the last one through the left. (01:18:30)
Continuity mistake: When Jack is trapped in the mine under a pile of wood the arrangement of beams changes from shot to shot. (01:25:00)
Continuity mistake: After Lionel Pond, the mine owner, dies from a heart attack he sits in his wheelchair with his head sunk deeply between the shoulder pads of his jacket. In the next shot he is sitting straight. (01:28:00)