Trivia: Roger Avery, who wrote the original film, originally planned on writing this sequel. However, he was jailed for vehicular manslaughter following a car-accident shortly before he began work on the script. He managed to work out a deal that would allow him to write the film from prison, but his negotiations with the studio eventually fell through, and he was forced to leave the project.
Trivia: Nicole's car bears Georgia license plate CHN 320. This is the same plate number used on the General Lee in "the Dukes of Hazzard".
Trivia: Katniss Everdeen and Peeta Mellark are the only Hunger Game tributes ever referred to by their first and last names. The other tributes are just identified by their first names, even when they're being introduced by Caesar Flickerman during the televised interviews or their scores are being announced on television.
Trivia: Kate Beckinsale's stunt double Alicia Vela-Bailey makes a cameo during the opening sequence as a vampire escaping the purge. (00:03:40)
Trivia: Rhythm and Hues won the Oscar for Best Visual Effects for this film. It was their third Oscar. But ironically, the company had to declare bankruptcy and lay-off half their staff just a few months before they won. And when the company was brought up during an acceptance speech for the film, the microphone was cut off. This led to widespread demonstrations and protests against the film and director Ang Lee by effects artists, as they are often marginalized, overworked and underpaid by studios.
Trivia: When the fireball starts rolling inside the Mayan City, two soldiers fall off a cliff and one of them yells a Wilhelm scream.
Trivia: Joseph Gordon-Levitt injured his arm whilst filming after colliding with a taxi window with his bike and required 31 stitches. A behind the scenes clip of this can be seen partway into the end credits.
Trivia: Originally Clair and Chris Redfield were to appear in the film after having been featured in previous movies. But script-changes lead to them being written out, and their fates were left ambiguous. Clair will be re-appearing in the sixth film, however.
Trivia: Dredd's face is never shown during the film. This is consistent with the comic strips in which Dredd is almost never shown without his helmet and, on the rare occasions when he is, his face is obscured in some other way. Fans were critical of the 1995 Judge Dredd film for the fact that Dredd spent much of the time with his helmet off and his face exposed.
Trivia: Kristen Stewart performed many of her own stunts in the movie.
Trivia: During one take of the fight sequence between the Evil Queen and Snow White, Julia Roberts accidentally pulled out some of Lily Collins' hair.
Trivia: When Mrs. Hills is offering Heather her grandmother's necklace, the man standing next to her is Jeff Kinney, the author of the books.
Trivia: Daniel Radcliffe plays the same character which Adrian Rawlins, who plays his father in the Harry Potter franchise, played in a 1989 British TV movie.
Trivia: Booker is a nod to "Good Guys Wear Black" in which Chuck Norris portrayed a character named John T. Booker. In both films Norris plays a retired military operative in a rescue mission to help his old comrades.