Trivia: The picture on the computer of the hive looks like an upside down umbrella and the name of the corporation who own the hive is ... the Umbrella corporation.
Trivia: "Bone-Saw" McGraw is played by real-life wrestler "Macho Man" Randy Savage. He started his wrestling career as a masked wrestler named "The Spider". (00:35:20)
Trivia: The big speech from "Couldn't you find anyone worse? A child molester..." to the bit where Stu is shot was filmed in one take. Colin Farrel did everything and surprised himself and the crew. When he hit the floor, the crew (and the extras) had to contain their applause until the cameras stopped rolling.
Trivia: Paul Thomas Anderson, who directed Tom Cruise in Magnolia, has a cameo on the train. It is reported that he is so hard to find that Anderson himself does not know where he appears.
Trivia: When the alien's hand comes out of the coal grate for Morgan, if you look closely you will see that the hand was already through the grate and the alien was using its colour changing abilities to hide. So if you look very closely you will that that the hand comes UP from the grate and not through it, and if you look VERY carefully you can see the outline of the hand even before Morgen says "What?"
Trivia: The message "For Sasha" which appears just before the end credits is a dedication to director Nick Cassavetes' daughter.
Trivia: In the party scene at XXX's house after he pulls the stunt with the Corvette, Joshua Todd, the ex-lead singer of Buckcherry, makes a cameo appearance - he never turns around, but you can see the suicide king of hearts tattoo on his back.
Trivia: This is Pierce Brosnan's least favourite Bond movie of the four in which he appeared. Brosnan disliked the over-the-top special effects and gadgets, and suggested to the producers that the follow-up should be dark and gritty. After Brosnan left, the series was indeed given a grittier reboot.
Trivia: At the end of the film, Rush is killed by Blade, who is hiding behind the curtain at a peep-show booth. In the 1996 film "The Crow: City of Angels", the lead character Ashe surprises a villain in the same manner. Both films were written by David S. Goyer. Goyer had disowned "The Crow: City of Angels" however, due to studio-enforced edits, and decided to re-use the scene in this film.
Trivia: The studio and producer Joel Silver reportedly called for major re-writes of the script shortly before shooting began. Many of the actors had signed up based on the original script, titled "Chimera", which contained far less violence and supernatural elements, and instead was a psychological drama about what happens to a salvage crew when they are stranded in the middle of the ocean. Much of the cast wasn't informed that the script had been almost completely altered into a more generic supernatural-horror/slasher film until just before they showed up to begin filming, leaving many of them disheartened and disgruntled.
Trivia: During the scene when Dolarhyde takes Reba to the zoo, the tiger she pets is not sedated. Because of the humane society they could not sedate the tiger. Instead the trainer is to the left just out of the shot keeping the tiger calm.
Trivia: The word 'tetragrammatron' has some very interesting origins which render the film either profound or pretentious, depending on your point of view. See http://www.bbc.co.uk/dna/h2g2/A3477909 for a full explanation.
Trivia: In the beginning, after Jason gets off the train, there is a shot of Jason outside at night looking up a snow-covered street with some footprints in the snow leading away from him. These footprints belong to director Doug Liman. (00:10:29)
Trivia: When the movie shows that Joe is selling his house, there's a real estate sign. Notice carefully it says, "Curtiss Real Estate", this is named after the person at the credits "In Loving Memory of Katherine Ann Curtiss." (01:38:40)
Trivia: In the scene right after Eddie Murphy gets in a fight with Owen Wilson and Eddie gets arrested, Owen is walking in an industrial area. While he is walking a "stray" dog runs behind him. I personally know that this dog belongs to the director.