- 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.
>>> 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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