Continuity mistake: In their first scene, Andy's mom wants him to go out some. She waves the phone at him holding it in two different ways (index on the top right corner or at the middle of the right side). (00:07:20)
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: Andy returns home a little early and opens the door finding mom doing tonsil hockey with a dude named Shane. The multicolored wrapping in her hand switches instantly from right to left hand as she realises her kid is there. (00:09:20)
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: 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: 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: On top of the ladder, the Xmas lights wrapped around Shane change between shots repeatedly. (00:38:00)
Continuity mistake: After giftwrapping the melon head, Andy and friends stumble upon his mom. When she asks "What is that?" her necklace pendant is stuck into the right part of the blouse. When she asks "Present? For who?" the necklace is placed differently. (00:43:25)
Continuity mistake: Having dinner at the mom of Detective Mike's, look at Mike's hand when she gets up saying "That's all." His hand is suddenly raised, eating, while they were both down and empty in the previous shot. Similarly a moment later Andy gives a nervous look to the gift, fork vertical - but he's eating in the following shot. (00:51:20)
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)
Continuity mistake: Andy just locked his friends out of the Zed Mart. In the overhead shot the cleaver is in the middle of the doormat section, while in the close-up it's across the two sections of the floor. (01:16:30)
Continuity mistake: After setting his mother free from the forklift, Andy grabs the knife and stabs Chucky in his power core, shutting him down. Moments later Chucky lunges towards him only to be shot by Detective Norris and the hole is no longer in his outfit. (01:21:03 - 01:21:44)
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).
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.