Corrected entry: When Chucky stabs Miss Kettlewell with the pump, you can see blood come out of her back. But in the next shot when she's falling onto the desks, no blood is shown.
Corrected entry: Why is Chucky's skull metal? Tommy's isn't as evidenced by Chucky crushing his head with a piece of porcelain. It doesn't make sense that they'd make one doll out of metal and the rest out of plastic.
Correction: Chucky is more updated than Tommy, meaning that Tommy just hasn't been made with a metal head yet.
There is no evidence to support this, nothing in the film says when Chuck or Tommy was made, Tommy could have been made long before Chuck for all we know.
Corrected entry: When Chucky has tied Andy to the bed he has stuffed a sock in Andy's mouth so that no one can hear him screaming. But when Kyle enters the room and takes the sock out of Andy's mouth you can see the sock almost isn't in his mouth at all. Wouldn't Andy be able to spit the sock out by himself? (00:29:25)
Correction: He's a kid, so that thought just didn't occur to him.
Plot hole: In the factory we see the machine that adds the hair to the Dolls it "punches" the doll at standing level. Andy hits the reverse button and they watch a doll go backwards. A few moments later Chucky appears on a cart and now the machine "punches" Chucky to the cart. 2 Errors -1 How did Andy and Kyle not see Chucky on the cart right in front of them. 2. What made the machine go low enough to stick Chucky to the cart.
Suggested correction: 1. Andy and Kyle were looking away, hence they didn't see Chucky. But then, Kyle turns and sees him. 2. We are to presume that the punch machine goes down until it is stopped by the doll it's meant to be "punching" into. So, it just descended until it reached Chucky and the platform he's on. (Additionally, the machine also seems to be malfunctioning given it goes into a sort of overdrive.)
Correction: He doesn't stab her in the back, he stabs her in the front. And due to the quick cutting, you never get a good shot of where she gets stabbed after the first two shots, as evidence by the linked video. So there's no real mistake.