- The "abandoned warehouse" where the final sequence in the film takes place is the same set where Chicago (2002)'s prison scenes were filmed.
- There are numerous references to Kurt Vonnegut Jr., including the computer virus being named Ice-9 (from "Cat's Cradle"), Clayton reading "Slaughterhouse Five" at the coffee shop, and Clayton referring to his father's eggs as the "Breakfast of Champions".
- The pictures that are shown during the opening credits, of James and his father, are actual childhood photos of Colin Farrell and his father.
- The scene where Colin Farrell's character tells the girl at the bar how he "just got out of jail" was Farrell's idea. He said he used it on a girl in a bar one time and that it worked, so the producers put the scene in the film.
- The computer code seen as part of Ice-9 is actually gibberish taken from code written in C for Windows using Hungarian notation for variables and seemingly part of an earlier routine to search for files. It is not syntactically correct - taken as a whole it's just gibberish.
- When shown in theatres, the movie was in an aspect ratio of 2.35:1. When it was released on DVD in May of 2003, it was presented in a ratio of 1.78:1, preserving Roger Donaldson's vision.
- While playing cards with the other recruits, Colin Farrell's character, Clayton, refers to his opponent, a former Miami cop, as "Sonny Crockett". Several years later Farrell would portray Sonny Crockett in Miami Vice (2006).
- Roger Donaldson's mother Dorothy appears as a bystander in the scene where James is chasing Layla to the train station.
- The glass encased roll of honor that Clayton looks at in his first day as a CIA career trainee includes the names of Deryck Blake, Andrew McAlpine and Dennis Davenport: respectively the Property Master, Production Designer and Art Director on this film.
- Richard Waugh's scenes as a drunk bar patron that Colin Farrell's character assists to get home safely were deleted.
- The character of the CIA Career Trainee Lisa Sahadi (played by Elisa Moolecherry) was revealed in a deleted scene to actually have been a CIA agent who is part of the new group and is gathering intelligence on the group.
- Colin Farrell states on the DVD audio commentary that while filming the scene in which he and Al Pacino's characters go to a restaurant, Al Pacino accidentally damaged the car they were riding in. The resulting damage can be clearly seen in the scene where Clayton and Burke pull up to the restaurant.
- On the audio commentary of the film, director Roger Donaldson and Colin Farrell joked that the huge rear projection screen on set (valued at $300,000) was powered by turbine pedaling monkeys to make it as bright as it was.
- At no time in the movie are any Microsoft products shown being used. Several times Macintosh computers are used, and in the scene where James is using Layla's computer while she is in bed, the alternative Opera web browser is prominently displayed, used with permission from Opera Software ASA.
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: Layla uses a Dell 16MB USB Key to sneak the ICE9 virus code out of CIA Headquarters in Langley.
- SPOILER: Body count: 3 (including James's father).
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