Trivia: Julie Delpy admitted that the only reason that she did this movie was because she needed to pay her rent.
Trivia: There have been rumors ever since the release of "Scream 2" that filmmaker Robert Rodriguez actually directed the scenes from the movie-within-the-movie "Stab." (This would explain why "Scream 4" states that Rodriguez directed "Stab.") However, there are also conflicting reports that director Wes Craven filmed the scenes for "Stab," and even some theories that both directors worked on the "Stab" scenes. To this day, the truth is unclear.
Trivia: Producers Gale Anne Hurd and Sam Mercer wanted to film the movie at the American Museum of Natural History in New York. However, the museum's administration was afraid that the film would not only cast the museum in an unflattering light, but it would also scare kids away from the museum. They were given permission by the Field Museum of Natural History in Chicago to film there, because they loved the movie's premise.
Trivia: Sigourney Weaver actually makes the basketball shot. Even though the ball is out of shot for a second, she made the shot with no assistance. The shot cuts quickly because Ron Perlman dropped character in celebration, which can be seen in deleted scenes online.
Trivia: Hammond doesn't appear in the second book (though he does in the second movie). This is because, in the book series, Hammond was killed in the first book. He slipped, broke his ankle and was fatally attacked by compies.
Trivia: At the dinner ceremony where Spawn attacks Wynn and kills Church, you can see a red-headed woman in a blue gown walking among the patrons in the beginning of the scene. The camera focuses on her briefly, but for a reason - look at her earrings. They are Spawn insignia. This is a reference to the angel Hellspawn hunter Angela, who wears those same insignia in the comics as trophies of her victories over previous Hellspawn. Very clever reference.
Trivia: All the characters in the movie are named after famous prisons around the world - Holloway, Wren, Leavenworth, San Quentin, etc. The characters match the prison types too - Alderson never meets the group, and isolation is the major form of punishment at Alderson Prison in West Virginia. Dr. Holloway is a female doctor, and Holloway Prison is a women's prison in England, Kazan is autistic, and Kazan Prison is Russia is a "disorganized" prison, etc.
Trivia: Many of the corridors in the Event Horizon are coffin shaped - perhaps foreshadowing the fact that it is a "death" ship?
Trivia: This movie features three horror stars. Beaumont is played by Robert Englund (Freddy Krueger), Johnny Valentine is played by Tony Todd (the Candyman), and the guard at the auction house is played by Kane Hodder, the man behind the mask as Jason Voorhees in several consecutive Friday the 13th films.
Trivia: Stephen King makes a cameo appearance as the band conductor of the 'ghostly' Gage Creed Orchestra.
Trivia: Film debut of Shannon Elizabeth.
Trivia: In the original ending as intended, the "King" of the Judas Breed wouldn't be killed by the train, but would rather in silhouette form back into a human "mimic." He'd step out of the shadows to reveal the perfect image of a nude human male. He would then point at Susan and in English tell her to "leave", implying that the Judas Breed had reached such a stage in their evolution to be able to perfectly mimic human beings, even down to speech patterns. This was in keeping with the original, much more apocalyptic tone of the story before script-changes forced by the producers.
Trivia: The original theatrical trailer for this movie includes the scene where Gary (Owen Wilson) is grabbed from behind by the snake and pulled backwards but the CGI snake hadn't been added in yet so you just see Gary falling backwards. This trailer is available on YouTube.