Continuity mistake: When Chris knocks Jason out with the shovel, the position of unconscious Jason's legs changes between shots. (01:20:30)
Continuity mistake: When Chris spots the axe in the stable at the end of the film, it goes from laying on the hay, to on a metal object between shots. (01:22:55)
Continuity mistake: After Chris wakes up in the boat, the front of the boat gets stuck in some logs. The logs change position around the front of the boat between shots. Also, hay appears on Chris's shirt after she wakes up. (01:24:50)
Continuity mistake: When Chris is put in the police car at the end of the film, the car window rolls itself up higher between shots. (01:27:10)
Continuity mistake: When the cops arrive at the store, they approach and the white cop comes in contact with someone to move them away. The camera then shows the van driving, with the passengers all looking down at the store. The next scene then shows the 2 cops approaching the store again.
Continuity mistake: The size of the knife that Jason kills Debbie with changes size. It's so long that it goes in through her back and comes out her chest. Then Chris removes it from her neck and it's shorter. Then Jason throws it at Chris and it's even shorter than before.
Continuity mistake: When the "stoned" couple makes popcorn, it is shown being poured from a pot on the stove into a bowl, cooked properly. A short time later when Chris and her boyfriend are searching the house they come upon the pot of popcorn on the stove burning, and they empty it again.
Continuity mistake: Jason's left eye is much lower on his face than his right eye, but it sits in a normal position behind the hockey mask.
Continuity mistake: Vera drops Shelly's wallet in the lake. She stands up and tries to reach it. Seconds later it has floated a ways from the dock but remains in the same spot until Vera goes in the water and picks it up.
Continuity mistake: When Vera is picked up by Chris, she brings no luggage with her yet throughout the movie she changes clothes and shoes.
Continuity mistake: During the one brief scene where we see Jason unmasked at the end of Part 2 when he crashes through the window and grabs Ginny, we see Jason has at least a partial head of hair. In this film, however, he's completely bald.
Continuity mistake: Part 3 picks up just minutes after Part 2. It shows Jason removing the machete from his shoulder. His flannel shirt sleeves are unbuttoned, whereas they were buttoned up in Part 2.
Continuity mistake: The last thing Andy sees is he walks down the hall on his hands is Jason slicing straight downwards at him with his machete. But this would have bisected him lengthwise, not at the waist. When we see his body up in the rafters, he's been sliced into a top half and a bottom half.
Continuity mistake: When Loco goes to the barn, he has a cigarette in his mouth. When he goes into the barn, it has gotten shorter although it's not lit.
Continuity mistake: Jason has dark Khakis throughout the film, until the very end. When the cops are at the house, his body is in the barn wearing blue jeans. In part 4 he is still in blue jeans, but then changes into dark Khakis after leaving the hospital.
