Continuity mistake: When Ash is burying his girlfriend, he cuts off her head, and he gets blood all over his face. He runs back to the house, and suddenly the blood is gone.
Continuity mistake: At one point in the movie, evil Cheryl thrusts her arms through the door, grabbing Ash, and creating two holes in the door. The size of these holes changes- compare them at the part where Ash is putting a bureau in front of the door (to keep Cheryl from getting in) to the part at the end where Ash is walking out of the cabin. (01:15:40 - 01:22:25)
Continuity mistake: As Cheryl is wacking Ash on his back with the fireplace poker, she is holding it with the pointed end away from her. When Ash burns the "Book Of the Dead" in the fire, Cheryl is holding the poker to hit him again but loses her grip. The rounded, knobby end would have struck the floor next to Ash's head, not the pointed end as shown in the shot, as it would have been pointed towards the ceiling.
Revealing mistake: When the girl chews off her own hand, when she pulls her face up, you can see the line where the makeup/mask ends and her normal skin begins. (00:45:30)
Continuity mistake: When the blond guy goes into the cabin in the beginning, it goes from day when he's walking in, to completely dark once he's opened the door and gone in. (00:06:00)
Visible crew/equipment: When Scotty enters the cabin for the very first time, he walks around for a moment. As he passes a window look into the reflection. You can barely see a man dressed all in black holding the camera. His brown equipment belt is very visible. (00:06:20)
Revealing mistake: When the blood filled light bulb explodes it is obviously not a real light bulb. When the mantle explodes you can see a small light bulb inside it. (01:11:05)