In the opening scene Michael Myers' and Jason's masks (from the Halloween and Friday the 13th movies), Leatherface's chain saw (from the Texas Chainsaw Massacre movies), and Freddy Kruger's glove (from the Nightmare on Elm Street movies) are visible.
In the opening shot, when the policeman is walking through the evidence locker room, several dolls appear. These resemble, or may actually be, from the movie series Puppet Master. They appear in the first storage case shown, on the left side of the screen.
When Chucky decides to kill Chief Kincaid, he first picks up a ball-peen hammer, only to put it down when Tiffany remarks, "Predictable." In the original Child's Play (1988), Chucky kills his first victim by hitting her in the head with a ball-peen hammer and sending her flying out a window.
According to the DVD's director commentary, Chucky was originally supposed to say to Chief Warren (John Ritter), "Sorry, Jack, but three's a crowd," after killing him. This joke refers to the fact that Ritter also starred as "Jack" in the hit TV sitcom Three's Company (1977). But at the last minute, the director deleted that out of the script because he found it too corny.