Continuity mistake: At the start of the film, the dog is seen going from room to room looking for food. Just before he goes into Dana's room, someone can be seen through the crack in the door, moving from left to right.
Continuity mistake: When Carol Anne is being sucked into the closet vortex she clearly lets go of the white wicker headboard of her bed. In the next shot, the child (actually a dummy or a stunt double) is seen sailing into the closet, grasping a sizeable section of the now broken headboard.
Continuity mistake: The wicker headboard of Carol Anne's bed is ripped apart when she holds onto it to try to keep from flying into the closet. Towards the end of the movie, when her mom tucks her into bed, the headboard is intact and has had no repairs.
Continuity mistake: A few seconds after Steve stops the car for his daughter, Robbie yells. During this brief scene you can see a bluish flannel on Robbie. About eight seconds later, Robbie's red pajamas reappear. Previous to these scenes, Robbie was wearing his red pajamas.
Continuity mistake: When the men are watching football, they are reacting as if they are watching live action. However, the images shown on the TV are clearly in slo-motion.
Continuity mistake: When the mother falls into the muddy swimming pool, and the bodies are popping out from the ground,she was drenched and covered in mud. By the time she runs upstairs, she is almost completely dry and there is very little mud on her.
Continuity mistake: When they put Diane and Carol Anne into the bath tub, near the end of the film, look at Carol Anne's face. The red gunk changes in pattern every time we look at it.
Continuity mistake: When Diane sees the creature in front of the door and yells "No - don't hurt my babies!" she crosses in front of it and falls down the stairs. When she's in front of it you can easily see the creature's eyes and mouth through her, on her shirt.
Continuity mistake: When the dog jumps in the back of the cab, he gets in the right side and Robbie is nowhere to be seen. It cuts away very briefly, and when it cuts back suddenly Robbie is very much on the right side of the seat and the dog is on the left- not enough time for them to have moved and settled in.
Continuity mistake: Right after JoBeth Williams and Craig T Nelson joke with Dr. Lesh about not showing the tapes of their haunting on "60 Minutes" or "That's Incredible", JoBeth walks to the table with Dr. Lesh's flask in her hand. As she walks from the sink, there's a silver cap on it. When she gets to the table, the cap is gone. She couldn't have removed it out of sight, she had a coffee cup in her other hand.