Visible crew/equipment: At the time when they get lost and stumble back to the river and the log, and Heather says "No, it can't be the same log", look across the river. There is someone standing there clad in white, and all three of them are standing on the same side of the river...
Factual error: During the scene in the supermarket, Mike holds up a PowerBar to the camera, but the flavor, Oatmeal Raisin, wasn't introduced until 1996, two years after the documentary was supposed to have been filmed.
Continuity mistake: When Heather first picks up the bundle of sticks she carries them to the river. During this she steps over a log on the ground and if you look closely you can see the black bag containing the guy's teeth fall out but when Heather opens up the bundle it is still there. She couldn't have put it back herself.
Factual error: I don't remember when it occurs, but you hear the sound of cicadas in the woods- this was supposed to take place in October. The last cicadas sound off in early september, during the warm weather.
Factual error: During the scene when the two guys are fishing, the guy on the right is using a bait casting rod, you can tell by the finger grip where the reel connects to the pole. The problem is, the rod is equipped with a spinning reel. A spinning rod has no finger grip.