Revealing mistake: The scene in the locker room when the bullies are dunking Marty in the toilet. Marty's "body" is a fake prop used - on the naked body mysteriously there is no penis or testicles. In addition to this, despite being turned completely upside down, Marty does not struggle in the slightest as he would in real life - he does not struggle at all exactly because it is a prop body being used.
Continuity mistake: In the scene when Carol is running from Marty, she hides in the gym. Marty runs into the gym. Carol runs out and goes down two flights of stairs. She then goes into a room by the stairs and goes to the window...the window that overlooks the gym. Somehow having gone down two flights of stairs Carol has ended up above the gym.
Plot hole: In the opening scene, the bullies all go into the girls' toilets with loads of camera equipment, including high tech ones used for proper films and boom mics. This equipment is way too expensive (even more so in the 80s when the film is set) for any high school kid to have.
Plot hole: When the bullies take revenge on Marty, they doctor the chemicals he is preparing so that they explode. The bullies were punished some time in the afternoon, judging by the sun in the very first shot. Their detention is at 4:30 in the afternoon. Somehow, they manage to acquire the necessary chemicals for the explosion within a couple of hours, even though they are stuck at school. In addition to this, they have no way of knowing what chemicals Marty is preparing, so even if they were able to get chemicals, they would not know which ones to get to destroy his experiment.
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