Continuity mistake: When a possessed Carol first uses the Ouija board, the planchette begins to move towards Yes. In the next shot it arrives on No.
Continuity mistake: When Adrienne sits on the couch, her cigarette swaps hands between shots.
Continuity mistake: When Kreon bursts out the grave, the grave lid flies all of the way off onto the grass. In the next shot it's halfway back over the grave.
Continuity mistake: Adrienne's hair repeatedly changes position when she hears the cat noises, before being attacked.
Continuity mistake: When Mr Adams gets attacked by the baby spider, its size and location changes between shots. At the start it's on his cheek. In the next shot it is now covering his face, and quite larger during the struggle and the closeups.