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: Robbie watches the tree and gets in bed. Next to him there's a yellow comic book underneath a Darth Vader bust. When his mother arrives the comic book is completely different.
Continuity mistake: After Diane places the chair to show Steve how it moves, the chair swaps from being parallel to him to slightly skewed. Also, its position on the floor changes: First the right legs aren't touching the brown lines, and a frame later they are.
Continuity mistake: In the opening sequence while the kids are in bed, the toys on Robbie's headboard keep changing. The Rams football helmet is always there, but next to it, you will see a Star Wars droid, a Rubik's cube, a race car, or a dinosaur, depending on which shot it is.
Continuity mistake: When the scientist's face starts to melt, the stuff on the wall keeps changing all the time.
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: Toward the end of the movie, as the family gets in the car and leaves, the garage door is closed on the house. But when the house begins imploding, suddenly the garage door is wide open. (01:48:10)
Continuity mistake: As Diane brings the freshly-washed flask to Dr. Lesh, who's sitting at the kitchen table, the flask jumps from one hand to another.
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: After the chair moves, Steve is in awe, his left hand on the counter. A frame later, on the close-up shot, it's on his thigh.
Continuity mistake: When the kids are sitting around the table saying, "Ask Dad" right before Robbie's glass breaks, he picks up the glass twice in two different shots.
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: Just after the dad pulls the boy out of the tree, they all go looking for the little girl. Watch the amount of mud on the boy. By the time he wanders in front of the TV, the mud on him increases. For that matter, the mom wanders in with more mud on her too.
Continuity mistake: A few seconds before Robbie looks at his clown toy, you can see a Rubik's cube near his head. When the camera angle changes, the cube is gone.
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: When Robbie wakes up to cover the clown, his grip on the jacket and the position of his head (crouched neck against breast vs raised neck) changes between one frame and the other.
Suggested correction: Diane could've bought a new headboard obviously.