Visible crew/equipment: When Andy and the doll gets out of school, the whole film crew is reflected in the doors.
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. (00:01:50)
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.
Suggested correction: The police believe Andy to be insane (hence why he is sent to a mental institution instead of juvenile hall), and thus do not believe his choice of victims to be in any way rational.
Also, as unlikely as it is that a six-year-old child could (or would) travel halfway across the city to murder a random person, the possibility that a child's doll came to life and carried out the act was considered far too outlandish at that point in the plot.
Suggested correction: We don't see the entire investigation. We just see the cops holding Andy then taking him to a psychiatric clinic. Chances are they were asking those questions and we just didn't see it because it's not important to the plot. Regardless, the cops have every reason to believe Andy either knows about or was partly responsible for the murders considering he keeps showing up at murder scenes. There's only so many conclusions you can draw, even if they don't make sense.
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. (00:07:25 - 00:08:15)
Continuity mistake: When Andy climbs aboard the train, we see in one shot the train has seven carriages. In the following shot the train has now got four carriages. (00:33:55)
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. (00:32:10)
Continuity mistake: When Aunt Maggie falls out the window, it is snowing. However, when she lands on the car, all the snow floating in the air has disappeared. (00:23:25)
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. (01:14:30)
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. (00:23:25)
Visible crew/equipment: When Andy upwraps his Good Guy doll, he says "A Good Guy! I knew it!", after he says this, you can see the shadow of a crewmember cast on Karens bare legs, moving around. (00:13:50)
Continuity mistake: When Chucky is electrocuting Dr. Ardmore, blood comes out of his mouth and eyes. Yet when Dr. Ardmore finally dies, there is no blood on or around his eyes. (01:07:15)
Visible crew/equipment: When Chucky has the voodoo doll of John, he walks along, then says "And you have a date with death!" After saying that, he turns, prior to stabbing the voodoo doll. After he says it, and turns, you can see the large, bald, shiny head of a puppeteer, crouched behind him!! (01:01:55)
Continuity mistake: After Chucky is set alight, as he knocks down the fireplace guard you can see both his shoes have come off. In the following shots as he climbs across the sofa, his shoes are back on. (01:15:35)
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. (01:09:35)
Audio problem: When Andy jumps on his Mums bed, on the morning of his birthday, he shouts "Wake up, Mummy, Wake up." but his mouth doesn't move. (00:08:50)
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. (01:21:20)
Continuity mistake: When Maggie starts cleaning up the flour, she hears a noise and looks at the three blue flowerpots, and there is a wooden chair right beside them. Then when it cuts to Maggie getting up, the chair is now about a foot away from the flowerpots. (00:22:50)
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. (00:16:10)
Continuity mistake: Andy puts Chucky in a rocking chair that is missing a runner on one side, then he goes for a tinkle. Yet we then see Chucky has gone from the chair, and the chair is now rocking, with both the runners intact. Then later when Andy returns the runner is missing again. (00:35:40 - 00:37:10)
Continuity mistake: In the opening shot of the scene of Andy's birthday, the camera pans across the Barclay's living room and stops in front of the TV. The TV and cabinet sit right beside the window and curtain. Yet later when Andy looks at the Good Guys Doll Advert from the kitchen, the TV and cabinet are about two feet away from the window and curtain. (00:06:30)
