Visible crew/equipment: As Rick and Chris get in the Volkswagen Bug after Shelly returns it, you can see three crew members in the backseat window reflection. (00:35:55)
Visible crew/equipment: When the camera pans past the door, as Chris walks to the cabin, the camera is reflected in the glass windows of the door. (00:22:25)
Plot hole: We see Jason get his outfit from Harold's clothes line. Yet in Chris's flashback Jason has these same clothes already on.
Suggested correction: I went and looked at both Chris version of Jason and Jason in the recent Part III. The Part III Jason outfit in Chris version has a lot darker clothes. Same style, just darker. That type of clothing is very similar though.
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. (01:14:40)
Revealing mistake: When the snake leaps out of the cage, you can see a dodgy looking fake snake attached to a wire spring. (00:12:35)
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. (01:02:25)
Continuity mistake: When Chris knocks Jason out with the shovel, the position of unconscious Jason's legs changes between shots. (01:20:30)
Visible crew/equipment: When Loco, Fox and Ali stand by the van before they steal the gas, the long black boom pole is clearly reflected in the back window of the van. (00:35:25)
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. (00:42:35)
Visible crew/equipment: After Vera says "uh-oh," as her and Shelley sit in the car outside the grocery store, the camera pans around to the side window. You can see a hooded cameraman reflected in the small triangular window, as the camera pans. (00:31:30)
Continuity mistake: When Chris shows Debbie the hammock, between shots the way the net hangs and the position of the net changes. (00:24:55)
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. (00:22:25)
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. (01:00:20)
Continuity mistake: Jason approaches Loco with a pitchfork with five prongs, but the pitchfork that enters Loco's stomach has only four prongs. (00:40:20)
Continuity mistake: When Shelly throws his wallet to Vera, he has a silver band around his left arm. Then when he says "Excuse me, but I believe that's my wallet", it has disappeared. (00:29:50)
Visible crew/equipment: When Chris is on the wooden beam in the stable, as she jumps down to land on Jason you can see a safety wire to the bottom left of the screen. (01:19:35)
Continuity mistake: When Chris runs into the bedroom away from Jason, there is a long decorative picture hanging to the left of the window, and between shots a long piece of brown string, hanging down the painting, alternatively appears/disappears. (01:14:30)
Visible crew/equipment: When the kids first arrive at the camp, as the camera pans as the van pulls up you can see a little bit of a white screen, a small bit of the camera and the top of a crewmember. It's clearer in the blue strip of the van.
Other mistake: There's no way for Shelly to fit his masks, a speargun and other items in the small box.
Suggested correction: No, but we don't know exactly what he might have brought. The first time we see him they're picking up Vera, so it's most likely he brought another bag that could contain the items. He only said to Vera that the small bag was his whole world, but he just met her (Andy mentioned he got him a date for the trip) and he's trying to get her to warm up to him.