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Continuity mistake: In the introductory scene, when Carol tells Marty she is wet all over, we see that Marty is wearing black underwear. In the very next shot the underwear has disappeared.

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Trivia: As the directors wanted a well-known actor to play the one adult character (the coach), they initially approached Peter Lawford for the role, but were not able to get him as he wanted $35,000 and a free shopping trip in Harrods, when the most the directors were willing to offer him was $25,000. In the end, one director (Dick Randall) got his friend Marc Smith to play the part for a mere $750.

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Visible crew/equipment: When Skip has just finished snorting cocaine and is talking to Stella, the boom microphone is visible on the top left of the screen.

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Trivia: The school scenes of the film were indeed filmed in a real school, not a movie set - they were filmed at St Marylebone Grammar School for boys in London. However, the shots of the school from the outside are actually shots of Holloway Sanatorium, near Virginia Water.

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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.

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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.

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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.

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Trivia: The lead actor, Simon Scuddamore, committed suicide a few weeks after finishing filming.

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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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Audio problem: Although the protagonists are all American, the actors are all English. This is why several characters mysteriously switch accents part of the way through the film - Marty speaks with a solid English accent after his first few lines.

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Question: The bullies think there is a real high school reunion going on. Yet having sat outside the boarded up and abandoned school for 3 hours, they do not seem in the least surprised and begin to doubt a reunion is taking place. They are not suspicious even when they have to break a window to get in to the school.Surely they would be suspicious by then and not go in?

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