Character mistake: When Detective Mike walked past 13-year-old Andy and his friends (depicted as neighborhood children or young teens), he said, "Little f-ing millennials." Millennials were born between 1981 - 1996, so their current ages would be 26 - 41 (or about three years younger when the movie was made). Andy and his friends would fall under Generation Z ("Zoomers"), born between 1997 - 2012 (current ages 10 - 25 or 3 years younger when the movie was made). (00:25:52)
Continuity mistake: Some shots (mostly front) of Andy sitting on the steps show him centered but other shots (mostly side) show him off-center, closer to the banister. (00:22:57 - 00:23:21)
Continuity mistake: When Chucky is controlling the car with the police officer's mother inside of it, pay attention when she says the line "You hobbit, mother****er!" In that shot, she doesn't have her seatbelt on. However, both before and after this shot, she has her seatbelt on. (It doesn't get taken off until a few shots later).
Factual error: After Detective Mike looked at Shane's body, the camera shifted to an aerial view of the city, which showed Fall foliage but it was after Christmas, when the trees in Chicago would have already shed their leaves. (00:40:50)
Continuity mistake: Andy has his jacket unzipped over a hoodie when he is walking home. When the camera shifts, Andy's jacket is zipped. When Andy opens the door to get into his apartment, he does not have his jacket or hoodie on and does not appear to be carrying them or his backpack. (00:32:35)
Continuity mistake: Front views of Andy throwing stones at the beer bottles on the garbage can show the garbage can angled to his right (which would be in the lower left-hand side of the screen). In rear views of Andy, the side of the garbage can is barely visible behind his right arm/shoulder, which would place the garbage can directly in front of him, not angled or in the path of the stones he threw toward and hit the can. (00:19:35)
Continuity mistake: When Andy is walking home, it isn't raining but an overhead view a second later shows him walking on wet pavement. When Andy gets inside the apartment building, he isn't wet. (00:09:08)
Continuity mistake: The first view of the smashed TV screen (by Andy) is different after a camera shift - instead of large glass panels covering most of the screen, there is only one section in the lower right-hand corner. (01:08:38)
Answer: I wouldn't read into it much more than just a joke: Chucky heard that joke earlier when the kids in the street were trying to make him do things for their cell phone cameras. So he just re-used it later as he often does in the movie.
Sammo ★
It was a joke that some kid said when he had the Chucky doll.