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 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. (00:31:30)
Continuity mistake: When Fox says, "You mean, may I please have the wallet." to Vera, she is holding the wallet. In the next shot you can see the wallet is rotated. (00:30:30)
Continuity mistake: When Chris pushes the crooked painting straight, there is a lamp in front of it. In the next shot the lamp is to the left of it. (00:23:15)
Continuity mistake: When Chris enters the cabin, Rick grabs her, and the cabin door swings to an angle so it's half shut. In the next shot of Rick it's open wide. (00:22:45)
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.
Revealing mistake: After Loco has been killed, it cuts to a shot of Fox, who is pinned up on the rafters with a pitchfork. She is clearly moving, however, despite trying hard to stay still. (00:40:40)
Revealing mistake: After Ali has smashed the front shield of the car it is obvious the window isn't made of real glass. It's made of plastic. (00:32:15)
Continuity mistake: When Ali pulls up his chain before he smashes the front shield of the car a piece of the chain is hanging down. When it cuts the chain is perfectly rolled up. Then later when he is about the break the side window it happens again. (00:31:55)
Continuity mistake: At the barn when Chris is being dragged up by Rick and Rick says, "You agree, I agree." you can see his hands gathered while holding the rope. When it cuts his right hands have moved further up the rope. (00:26:30)
Continuity mistake: When Harold is at the toilet you can see a shelf behind him with a fire extinguisher and a piece of cloth on it. Also the shelf is by his waist level. A moment later the extinguisher has changed, the piece of cloth is gone, the shelf is by his shoulder level and a clock has suddenly appeared on the wall. It is obvious this is a change of stage scenery. (00:13:15)
Continuity mistake: When Vera is sitting by the dock, Shelly grabs her foot from underwater. In one shot, her shoe clearly comes off, then moments later is back on perfectly. (00:53:40)
Revealing mistake: When Harold is stabbed with the butchers knife, you can see the bulge and outline of protective padding under his shirt. (00:14:40)
Visible crew/equipment: When Jason is shooting at Vera with a harpoon you can see the wire attached to the arrow. (00:57:50)
Continuity mistake: When the kids stop for the police cars who rush by we get to look out the back window of the car. You can see a car and a road sign there. These two wasn't there when they pulled over. (00:19:20)
Factual error: Jason picks up a red hot poker from the fireplace and it sizzles. Fire pokers only sizzle if they touch something. (01:08:56)
Visible crew/equipment: When the gang get out of the van when they arrive at the camp, Chris tells them that she is going to take a look around. She then opens the rear door of the van and you can faintly see a reflection of a boom mic. (00:22:15)
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: When Chris shows Debbie the hammock, she removes a board and lowers her arm. When it cuts her arm is back up on the board. (00:24:55)
Answer: The very ending of part 2 proves this, as Ginny appears again found by the police and ambulances. 1) if Jason really got her she would be dead, not alive, he wrapped around her. 2) Paul was dead, not alive and 3) as far as Jason's appearance she would not be able to stand it at first glance, so in her head she would put more human features on his face to be able to deal with it.