Trivia: Had the longest timegap between sequels, coming out nine years after the previous film, "Seed of Chucky." The long wait was in part because a few years after "Seed" was released, several attempts were made to remake/reboot the series, given the rising popularity of 80's slasher-film reboots. Despite several false starts, the reboot never happened. Eventually, series creator Don Mancini opted to instead perform a "tonal reboot" of the series with this film - by setting it in the same "universe" as the other movies, but shifting the focus back to classic horror and delivering a film more tonally similar to the original 1988 film. Mancini wanted to please fans, who expressed interest in seeing another "scary" Chucky movie after the previous two films had become increasingly comedic in tone.
Trivia: The appearance of Charles Lee Ray on-screen during the flashback sequences marks the first time that Brad Dourif had appeared in human form in one of the "Chucky" films since the original. (Although photos of him from the original did subsequently appear in the other sequels, he had not shot any new live-action material in 25 years).
Trivia: The production attempted to keep the cameo performances of Jennifer Tilly and Alex Vincent secret. They were unlisted in the cast and promotional material for the film. However, after early screenings of the film, their cameos were leaked online.
Trivia: Co-star Danielle Bisutti was related to a studio executive at United Artists. When she was a kid, she visited the studio and saw the poster for the original "Child's Play" and was horrified by it, saying that it "haunted" her. This makes it all the more ironic that she would go on to star in "Curse of Chucky," one of its many sequels.
Trivia: Christine Elise, who previously played Kyle in "Child's Play 2", was originally meant to play Nica's mother in a cameo, as director Don Mancini wanted to work with her, but due to casting laws in Canada, where the film was shot, Elise wasn't able to be cast. Mancini later brought her back as her original character Kyle in "Cult of Chucky" and the "Chucky" TV series.
Trivia: Lead effects artist Tony Gardner actually filmed Chucky's voice actor, Brad Dourif, when he was recording his lines to use as reference, since Dourif had a tendency to move and gesture a lot when recording his lines. Gardner then had the puppeteers replicate Dourif's mannerisms as closely as they could with the Chucky doll. Dourif's daughter, Fiona, who stars in the film, was very amused by the fact Chucky was moving almost exactly like her father does in real life.
Trivia: The elevator seen throughout the movie wasn't actually properly functional, since building a functional elevator would have been prohibitively expensive. In order to make it move, it was rigged to a forklift via a concealed winch. The forklift would drive back and forth, pulling the winch and making the elevator move up and down.
Trivia: The interior of the house is actually the same indoor set used for the 2012 TV movie "Home Alone: The Holiday Heist." Since it was already built, it saved the production a ton of money. All they had to do was modify it to look more gothic and add the elevator, and it suddenly looked like a completely different "house."
Trivia: In the first cut of the film, Alice was actually killed by Chucky right after he comes to life, and she would have been the first victim, as well as Chucky's youngest victim at that point in the franchise. However, due to the tragic Sandy Hook shooting, the studio and director Don Mancini decided to change her fate and instead have Chucky possess her. The scene of Chucky locking her in the closet and the final scene of her being possessed were added during post-production.
Trivia: Nica's night-robe was inspired by the lead character in the movie The Fury, which is one of director Don Mancini's favourite films.
Trivia: Officer Stanton being killed by Tiffany is an almost exact duplicate of the opening scene of "Bride of Chucky." The dialogue he says on the phone is exactly the same dialogue that Officer Bailey says. Tiffany dispatches both men in the same way. Chucky is inside a black plastic bag in both scenes, and both scenes even have a steely blue due to the lighting.
Trivia: The first film in the franchise where Chucky (or a Chucky duplicate) is not killed during the climax. Up until this point, every film followed the classic slasher trope of the killer dying and being resurrected in the next movie. (Technically, a Chucky is shot but not killed in a post-credits scene).
Trivia: Summer H. Howell, the little girl who plays Alice, had to be filmed separately from the "stitched up Chucky" in the final scene because she was too scared of his creepy, scarred face. Her lines and Chucky's lines were shot separately, and then simple split-screen effects were used to put them together.
Trivia: Chucky voice actor Brad Dourif suggested his daughter Fiona to series creator Don Mancini for a role. She originally auditioned for the part of Barb, but Mancini felt she would be a perfect lead. However, he then became incredibly apprehensive to cast her, as he worried it might feel too much like stunt-casting. He also worried it would seem like he was trying to, as he put it, "kiss Brad's ass by casting his daughter." Mancini eventually went with his gut feeling and cast her.
Trivia: The lead character is played by Fiona Dourif, daughter of Chucky voice-actor Brad Dourif. She has jokingly referred to herself as the "real 'Seed of Chucky'", and admitted that she exploited the fact that her father voiced Chucky to get dates with cute boys in high school, since it made her one of the "cool kids." But as happy as she was to be part of the franchise, her father Brad was even happier - he often proclaimed that Fiona's participation was the most exciting part of the film for him.
Trivia: Part of the idea for having Nica be wheelchair bound is that series creator Don Mancini was tired of hearing people dismissively say "You could just kick him!" in regards to Chucky. To finally shut that complaint down, he purposely made a protagonist that couldn't "just kick him" and would instead have to use her cunning to defend herself.
Trivia: Spoilers. When Tiffany appears in a bit of a surprise cameo, her introduction is an almost shot-for-shot recreation of her introduction two films prior in "Bride of Chucky." Even the circumstances are the same - Chucky is in a black garbage bag having been taken from evidence by a cop who is selling her to Tiffany.
Answer: The films don't delve into either Chucky or Tiffany's backstory, and the films themselves are the only official canon. So until it is properly addressed in the movies, it's basically up to your imagination.