Continuity mistake: Cheryl's bracelet switches arms after she starts running from the forest. (00:26:10 - 00:27:20)
Revealing mistake: When Ash is about to gouge out Scotty's eyes, you can see there are already holes in the eyes before he does it.
Revealing mistake: When everyone in the car pulls off the bridge at the beginning they're on the path to the cabin but when Ash and his sister leave the cabin to go back to the bridge suddenly they're speeding down a gravel road.
Continuity mistake: When Scotty stabs Shelley in the back with the sword, she falls and lands on her back, which should have impaled her, but when she's on the ground the sword is nowhere to be seen.