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When Chris first picks up the double-barrel shotgun in the cabin, it makes a noise like a pump-action.
As the group is walking down the path, the flower appears on Scott's necklace before Carly picks it and puts it there.
The flower in Scott's necklace disappears and reappears between shots.
When Carly hides from Scott on the road, his collar is flipped up in one shot, down in the next, then back up again.
When Halley falls from the cliff her back is to the ground but when she lands she is facing the ground.
The Mustang has both front and rear Pennsylvania plates. PA doesn't use or require front plates, only rear ones.
When Chris takes the CD out when it starts to skip, he drops it and puts it back in. The song starts to play right where is left off. In real life this would not happen.
When Scott is shot by the arrows, we see him fall. If you look closely at his leg when he hits the ground, you can plainly see a plastic tube that is pumping fake blood to his "wounds".
When the dead Francine is dropped to the floor of the cabin, her pulse can be seen on her neck.
When Chris goes back into his car after asking the truck driver about the accident, he sits in the seat, and you can clearly see that it's the scenery that moves and not the car.
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