Corrected entry: How come they have the battery power to film for so long? They're in the woods for longer than they thought they'd be, and surely they didn't bring hundreds of spares, just in case!
Corrected entry: They have Heather twice on the two different cameras - it's really obvious when she finds the mysterious thing, and the second obvious time is when she pants and slows down.
Corrected entry: In the scene where they're crossing a small river we can see Heather Donahue stepping on the log, beginning her way. The one who is shooting her uses a black and white camera (they had two cameras: a small color camera and a big black and white for their movie) and he already crossed the water, so Heather is approaching. Seconds later we see Donahue from behind, already on the destination side and we see it in black and white. But the person with this camera has already crossed the river.
Corrected entry: Once lost in the woods, a pretty standard tactic is to follow the river: it must eventually lead out of the woods. But these 'seasoned hikers' seem to just keep walking aimlessley in random directions.
Corrected entry: In the beginning they are interviewing ordinary people (locals) before going off into the woods for a weekend documentary. Two of the people they happen to interview are two local yokels fishing in a small, shallow river. The mistake is that the men are fishing in the river, and one of the men is using a large, open water lure called a 'Rattle Trap', a lure that's primarily used for largemouth bass in large, open waters, not shallow trout streams. You can't present a 3" lure to a 10" fish. It just doesn't work.
Corrected entry: If Heather sleeps like a rock, why is it that she can hear everything that goes on at night? Do they wake her up?
Corrected entry: There is one point in the movie where Heather is crossing a log but you hear her also talking right next to the camera that is filming her, as if filming herself. It's very brief, but it's there.
Corrected entry: In the last shot of the last scene, who is holding the camera that focuses on Josh from behind, if Heather is screaming far away from the camera?
Corrected entry: At the end of the movie when the main characters are looking for Josh in the old house. When Heather is about to walk down stairs she pans across a window if you watch it in slow motion you see a person through the window outside the house. There's no way that could be glass still in that house so that could not be a reflection.