Character mistake: When Trish's car stops running, Tommy states that its the solenoid that is the issue. A starter solenoid is responsible for sending voltage to the starter when the ignition is engaged. 1st problem: The car would not stumble and stall because of a faulty solenoid. 2nd problem: The starter was already engaging while Trish was hitting the key. So bridging the solenoid was pointless. The only reason to bridge a solenoid is to create a connection from 12 volt to the starter when the internal system is compromised due to wear. But that wasn't the case because when she was trying to start it, the starter was turning the engine. Plus the solenoid has nothing to due with the way an engine will perform (running, misfiring, not running).

Friday the 13th: The Final Chapter (1984)
1 character mistake - chronological order
Directed by: Joseph Zito
Starring: Crispin Glover, Corey Feldman, Peter Barton, Erich Anderson, Judie Aronson, Kimberly Beck
Genres: Horror
Revealing mistake: Trish jumps out the window and lands face up on the ground. You can plainly see it's Kimberly Beck's stunt double. She looks nothing like her. (01:21:35)
Jimmy: Ted. I think... I think when we get to town I should call Betty.
Ted: Jimbo, calling Betty is definitely a dead fuck thing to do. Look, first rule of love: never get rejected by the same girl twice. I mean, that's useless. If you want to make a fool out of yourself, always do it with someone new.
Jimmy: I don't know anyone new.
Ted: Well, sex is a great way to meet them.
Trivia: Peter Barton was hesitant when it came time to do his death scene, as he was previously burned by a magnesium flare doing a stunt on a previous film and required multiple surgeries afterwards. Sensing Peter's hesitation, Ted White requested that a pad be placed behind Peter's head when he was slammed into the shower wall.
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Chosen answer: He's not possessed. Dealing with Jason made him go crazy. In part 5, we find out he was in a mental hospital for a while, then gets sent to a home for troubled kids.