After Annie is killed, when Jake and Chucky are in his room talking, the length of Chucky's legs change from scene to scene.
When the mom and dad are talking in the kitchen with the detective the mom starts moving her fingers then she puts her and by her shoulder but in the next scene she is moving her fingers again and in the next scene her arms are folded.
The "Halloween - 1965" scene at the beginning, which is supposedly happening in the USA, is revealed to be filmed in Canada, where "Rockets" candy can be seen, which is instead called "Smarties" in the USA. The Canadian Smarties are an entirely different candy.