Continuity mistake: When Andy is grappling with the "buzz-cut" Chucky and trying to rip his clothes off, at one point the camera cuts from a medium shot to a closeup as he rips Chucky's overalls down. In the medium shot, Chucky's left arm is reaching for Andy's wrist, but isn't holding it. But in the closeup, suddenly Chucky is grasping Andy's wrist.
Continuity mistake: When Carlos is killed by the three Chuckies with different weapons simultaneously, the editing gives away that three different prosthetic chest-pieces were used to accomplish the effect - one for each weapon. The blood and wounds on his chest and stomach are inconsistent from shot to shot as we see the different weapons slashing and stabbing him. His body also wriggles about a bit differently from shot to shot.