Visible crew/equipment: When Andy upwraps his Good Guy doll, he says "A Good Guy! I knew it!", after he says this, you can see the shadow of a crewmember cast on Karens bare legs, moving around. (00:13:50)
Visible crew/equipment: When Chucky has the voodoo doll of John, he walks along, then says "And you have a date with death!" After saying that, he turns, prior to stabbing the voodoo doll. After he says it, and turns, you can see the large, bald, shiny head of a puppeteer, crouched behind him!! (01:01:55)
Visible crew/equipment: When Karen Barclay has Chucky trapped in the fireplace, and she is sitting on the floor holding the door/cage thing, you can see the puppeteer's hand controlling the Chucky puppet. (01:14:30)
Visible crew/equipment: At the end of the film, the burnt head and body of Chucky are thrown across Karens bedroom, below the window. The body twitches, then suddenly jumps up. The body's (one) leg actually doesn't touch the ground! The body rises with no real support, so if you look under the body, you can see a black rod/sheet (coming from through the carpet), pushing the burnt body up. (01:21:50)
Visible crew/equipment: When Andy and the doll gets out of school, the whole film crew is reflected in the doors.
Chosen answer: This isn't a mistake. John made the voodoo doll himself. When Chucky said he was "prepared" for it, he meant that he was prepared to do whatever it takes to get information from John about his being wounded. Even killing him as we see.