Continuity mistake: When Claudette and the counsellers are singing in the beginning, the close-ups of Claudette show her legs crossed, but the far-away shots show her legs spread apart. (00:02:10)
Continuity mistake: When Annie goes over to the dog and stops to talk to it, in the first shot the dog is in the sun, yet in the next shot it is completely shaded. (00:06:50)
Continuity mistake: When Annie talks to the dog, its position changes between shots. (00:07:00)
Continuity mistake: When Annie gets into the bar and asks about Camp Crystal Lake, you can see the woman behind the counter standing leaning in at the end of it. Then two cuts later she turns around, suddenly standing by the cashier. (00:07:40)
Continuity mistake: While Annie is talking to the woman in the bar the guy that washes the floors (that appeared earlier standing on the other side of the counter) now stands behind the counter by the woman. When Annie is leaving the guy stands on his original position. (00:07:55)
Continuity mistake: In the shop Annie enters, the tissue dispenser and boxes move much further away from Enos between shots. (00:08:05)
Continuity mistake: When Enos is about to give Annie a lift he says "Ok kid, let's move", we see the red clothing going over her shoulder covering her bag's strap. When it cuts the strap is visible. (00:08:10)
Continuity mistake: The trees and scenery around and behind the truck, as we first see Ned, Bill and Marcie, changes bewteen closeups and wideshots. (00:12:00)
Continuity mistake: When Steve is talking to Alice, and begging her to stay another week, he puts his hand up onto the roof as he talks. In the next shot his arm is down. (00:15:30)
Continuity mistake: When Alice runs to the lake to Bill she says "Bill, Steve wants to know if you need more paint", while holding her arm to her hip. When it cuts her arm is down. (00:16:20)
Continuity mistake: When Ned is aiming the bow at the girl the angle of the bow changes between the shots. (00:18:00)
Continuity mistake: When Annie is hitchhiking and the red truck pulls over she is standing in the shade. When it cuts she is standing in the sun. (00:18:30)
Continuity mistake: Just before Annie jumps out of the van, the truck is turning a bend. When the truck stops and backs up, the road is straight. It's a clearly new road. Also, the trees and leaves along the ditch have changed. (00:19:55)
Continuity mistake: As Annie backs into the tree, and then has her neck slit, her hair changes styles between shots, and the amount of leaves in her hair changes as well. (00:21:15)
Continuity mistake: At the lake when they pull the floating object by the pier the girl on the right side is about ten feet ahead of the object. When it cuts she is behind it. (00:21:35)
Continuity mistake: When the kids are at the beach, Brenda shows up saying "Hey you guys. Ready to get back to work?", while placing her foot on a red towel. When it cuts the towel has changed position. (00:23:00)
Continuity mistake: Brenda is seen swimming really far out to rescue Ned, and Marcie rows her boat out to the middle of the lake, yet when they rescue Ned, they are right beside the white decking. (00:23:15)
Continuity mistake: When they see the snake in the cabin they all jumps after it under the bed in panic. But in the next shot from under the bed you see them calmly lifting the sheet on the bed to look under it. (00:25:25)
Continuity mistake: First Bill and Alice are looking under the bed for the snake. In the next shot Alice is not the one looking under the bed, but she is kneeling behind Marcie, who now is looking under the bed with Bill. (00:25:35)
Continuity mistake: When Steve's car won't start you see a police car pull over. The sheriff turns on its red lights and Steve goes towards it and opens the door. In the next shot you see him talking to the sheriff, but now the lights are off, it cuts again and the lights are on. (00:50:30)
Answer: 1. She was most likely hanged. 2. Mrs. Voorhees wasn't possessed by Jason. She simply went insane when Jason drowned and wanted revenge. 3. He's not burnt, only disfigured.