Worth noting is that the graphic novel was written at a time in which the openly fascist and borderline Neo-Nazi National Front were a highly visible, if minor, force in British politics. Then again, there's the BNP now, so it's not like that much has changed.
Disowned Adaptation: Moore specifically requested that his name be removed from the film's production after Joel Silver (the producer) lied about Moore's enthusiasm for the shooting script.
Meaningful Release Date: It was originally scheduled to open on November 4, 2005 (the day before Guy Fawkes Night/the 400th anniversary of the Gunpowder Plot) but was delayed four months due to Warner Bros. being unsure about its box office prospects.