Continuity mistake: When Debbie is killed in the hammock, in all shots of her, the quilt covering the hammock net has patterns sown on it, such as flowers. However, in the closeup of Debbie as the knife comes through her chest, the quilt covering the hammock is the same one as before, however you can now see it is suddenly the other side of the quilt.
Plot hole: Jason somehow manages to get the two halves of Andy's dead body on the wooden ceiling rafter, with no blood dripping onto the hammock and staining it, or getting none onto the floor. Debbie then gets into the hammock, and about a minute later, blood starts dripping - for no apparent reason. Why?
Revealing mistake: When the snake leaps out of the cage, you can see a dodgy looking fake snake attached to a wire spring.
Continuity mistake: When Chris and Rick get stuck in the woods, Rick puts a coat on Chris. In a wide shot Chris pulls the sleeves of the coat up and then starts adjusting the shoulders of the coat. It cuts to a closeup and she is now rolling the sleeve up again, and then adjusts the shoulders again too.
Revealing mistake: When Chris is trying to escape out of one of the first floor windows, the shots you see from outside are of a stunt double with really bad frizzy hair.
Continuity mistake: When the camera pans past the window, to the door, showing Chris walking up to the cabin, there is no painting hanging next to the door. When she gets in and talks with Rick, there is a long painting hanging to the right of the door.
Continuity mistake: After Edna yells through the window at Harold for knocking down the clothesline pole, she slams the window shut and the end of the curtain gets trapped under the window. Then the scene cuts to show Edna from the inside, and look at the curtains from this shot. They are now hanging straight down, just like it should be and aren't trapped.
Continuity mistake: When they arrive at the lake and get out of the van, the long shot from the passengers' side shows Chris getting out and slamming her door, but then the next shot from the driver's side shows her getting out and slamming the door again.
Revealing mistake: When Debbie is in the shower and we see a shot of her through the shower curtain, you can see that she is wearing white underwear.
Revealing mistake: Near the end of the movie, as they are about to walk out of the barn thinking everything is over and Jason has been hung on the hook from the loft, if you look between the cracks of the barn door, you can see Jason being lowered right before the doors open.
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.
Revealing mistake: During the opening sequence involving Harold and the clothesline, there is a foreign object on the lens of the camera - noticeable in the bottom left corner in several shots.
Continuity mistake: When Shelly screeches out onto the road, after the windows on the car are smashes by Ali, you can see a large 'Olympia' lorry parked perfectly straight, outside a garage. Then between shots when Shelly goes speeding towards the gang's motorbikes, the lorry is suddenly parked at an angle, now sticking right out into the road.
Continuity mistake: When Rick is about to go for a drive in his car, and Chris is begging to come, we see Rick is holding just keys and that Chris's hands are empty. It cuts to the POV of Jason watching them from the stable, and Rick hasn't moved or picked anything up. It then cuts back to a closer view of them again, and now Rick has a golden coloured coat in his hand.
Continuity mistake: When Shelly and Vera get into the car after their run-in with the biker gang, you can see the area around where the windshield wipers are attached to the bonnet is all perfectly painted. However after Shelly reverses into the motorbikes, it cuts to Shelly and now there are large areas of rust around the wipers.
Continuity mistake: When Jason is chasing Chris, Chris runs into a bedroom and onto a bed, and then grabs a chair to smash a window, and the chair flies out the window. However, when Chris falls out the window we see the chair again, however the chair is a totally different chair, as the spindles on the legs of the chair have totally changed, and the back to the chair is different.
Continuity mistake: Jason approaches Loco with a pitchfork with five prongs, but the pitchfork that enters Loco's stomach has only four prongs.
Plot hole: When Loco goes up the ladder in the barn, he looks around for Fox. But he doesn't see her hanging by her neck until he turns around to go back down the ladder. There's no possible way he didn't see her the first time he went through there - there's nothing blocking the view.