When Audra goes into the bathroom of the vacant house, the orange-colored manufacturer's tag on the NEW toilet tank disappears and reappears during the scene. Also, why are the electricity and water utilities 'on' at a house that has been vacant for years?
At the beginning of the film, the girl in the field steps on a bear trap, apparently put there by Plasterhead. When she is shown captive, she uses her feet to bring the bag over to her, showing that both feet (and shoes) are perfectly fine, no bear trap damage.
During a nighttime scene in Plasterhead's house, Maggie (Kathryn Merry) is standing in front of a candle, the only light source in the room, yet her shadow is cast on the wall behind the candle.
The bare light bulb hanging from the ceiling is a halogen bulb with a plastic casing resembling an incandescent. These bulbs were not around when Plasterhead would have first wandered onto the property 15 years prior.