Trivia: Jennifer Tilly was reportedly very game for playing herself in the film and had a lot of fun portraying a satirically exaggerated self-conscious/mean/slutty version of herself. In fact, she and writer/director Don Mancini had a little too much fun making the "Jennifer Tilly character" over-the-top... the studio actually had to give them a note telling them to make the character "a little more palatable," because while she was absolutely hilarious... she was also becoming completely unlikeable.
Trivia: Was originally going to go into production in 1999 shortly after the release of "Bride of Chucky," but was indefinitely halted following the Columbine Shooting. Studios got cold feet about horror movies for a while, and given the script dealt with violence and children, they especially wanted to distance themselves from it. It finally went into production and was released five years later.
Trivia: Just a fun detail that you might not pick up the first time... Tiffany calls up the widow of one of her victims to apologize for killing her husband. She refers to her as "Mrs. Bailey." If you pay close attention in "Bride of Chucky," it's briefly alluded that the cop in the opening scene (that Tiffany kills) is named "Bailey." (It's on his Zippo lighter.) So it's his widow that Tiffany calls in "Seed of Chucky."
Trivia: A disclaimer had to be added to some of the trailers and commercials clarifying that "Britney Spears does not appear in this movie," due to a gag in which a lookalike was cast to portray Spears and is killed by Chucky. Spears' management team was worried her fans might go see the movie expecting her to be in it in a larger role, only to be disappointed that it was a lookalike in a short 30-second scene, so they asked the producers to add the disclaimer.
Trivia: The film was being produced by Focus Features. However, as Focus primarily worked in more artsy films at the time, they ended up purchasing and reviving fellow production company "Rogue Pictures" (which had been dropped four years earlier by Universal) to release this film and other similar works. "Seed of Chucky" ended up actually being the second film release under this revived banner, with the first being the American release of the comedy "Shaun of the Dead."
Trivia: The gag in which the Tiffany doll accidentally grabs the puppeteer's groin was a bit of an inside joke. During production of "Bride of Chucky", one of the puppeteers kept having the Chucky doll grab Jennifer Tilly's boobs as a joke during takes. (And there is indeed a few shots where this can be seen in the final film.) As a bit of a goofy bid of "vengeance", director Don Mancini added a scene into this film where a puppeteer is similarly grabbed in the groin.
Trivia: Cult director John Waters is a massive fan of the Chucky movies - especially Bride of Chucky. He's such a big fan, he even owns a life-sized replica of the Chucky doll, which he keeps in his bathroom on display. As a thank-you from creator Don Mancini, the part of "Pete Peters" the paparazzi was written especially for him. Waters gladly accepted the role.