Continuity mistake: Opening scene where Chris Sarandon is chasing Brad Dourif into the toy store. During the gunfight, Sarandon has gloves on. As he enters the store he is wearing gloves. The next shot, the gloves are off. The next scene, the gloves are back on and he takes them off by biting the fingertips and pulling them off.
Continuity mistake: When Andy pours the cereal, and then the milk, there is cereal on the counter, to the left of the bowl. There is loads of cereal on the counter, then when Andy puts the burnt toast onto a plate, there is much less cereal. Then when he takes the tray from the counter, there's now loads of cereal on it.
Continuity mistake: Between shots when Maggie falls out of the window, the length of the wall in between the three windows increases. In the first shot the wall in between each window is half a brick long, In the wideshot the wall has increased to over a brick long. The whole arrangment of the bricks around the windows differs - obviously two different sets.
Continuity mistake: After Maggie has been killed, on the same night Karen talks to Andy about Chucky, telling him that he's just a doll. Karen then tucks Andy in bed. As she tucks him in, Chucky is on the right side of the bed and is falling off of the pillow, down by the side of it. Yet when it cuts to a closeup, Chucky is now perfectly positioned in the centre of the pillow.
Continuity mistake: When Andy returns to the apartment, he goes to his room and shuts himself in his spacious cupboard. In the cupboard there's a pile of toys including a red remote-control car, a baseball bat etc., and between shots the pile of toys changes. Eg. when Andy looks at the pile, the baseball bat is totally exposed, yet when he picks up the remote-control car the bat is wrapped in a sweater.
Plot hole: Andy is suspected of having killed Eddie Caputo, because he was at the scene when Eddie's house blew up and Eddie was killed. But there are glaring things that go unquestioned: None of the cops seem to think it's strange that a six-year-old kid would travel by himself so far to some random house in order to blow it up. The South Side neighborhood where Eddie lives is halfway across the city from Andy's apartment. How did Andy know where Eddie lived? How do the cops think he even knew Eddie at all? None of them address this most puzzling problem.
Continuity mistake: When Chucky's fried, decapitated body comes out of the vent and grabs hold of the policeman's neck, the policeman whirls around and knocks a basket and another object off of the TV. The shot goes to the other three, but when it goes back to Chucky and the cop, the items are back on the TV, untouched.
Continuity mistake: When Andy is about to brush his teeth, Maggie takes all of the bowls and plates from beside Andy's birthday cake and starts putting them away in the cupboards. Then a few shots later, Maggie walks back to the birthday cake and picks up some more bowls/plates, which have appeared beside the cake.
Visible crew/equipment: When Karen Barclay has Chucky trapped in the fireplace, and she is sitting on the floor holding the door/cage thing, you can see the puppeteer's hand controlling the Chucky puppet.
Continuity mistake: When Karen brings Chucky to her apartment, she forces that he talks and he doesn't, so Karen goes to the kitchen for a glass of water, and as she walks to the kitchen you can see the TV in the lounge with nothing on top of it. Yet moments later, when Karen threatens to throw Chucky into the fireplace, there are books/videos/papers on top of the TV.