- Billing Displacement: The film advertising prominently places Sienna Miller with Daniel Craig, even though she plays a minor character in the film.
- Breakthrough Hit: For Matthew Vaughn as director.
- The Danza: The Dragon Dragan is played by the Serbian actor Dragan Mićanović.
- Executive Veto: In the novel, in the scene where X tries to use the Sniper to kill one of the Ruthless Foreign Gangsters, an American tourist is mistaken for the target, and is killed by the Sniper. This is partially Played for Laughs, because when the actual target runs away, the Sniper refuses to shoot him, as he was only paid for one killing that day. It's indicated that the death is spun as a casualty of the War on Terror. When the film was made, distributors thought that this wouldn't go over well, especially in America, so it instead became a scene where the Sniper got killed by a Scope Snipe.
- Fake Nationality: The Serbians are played by Romanians who, when not speaking English, speak Romanian. Made even more amusing as their boss invokes a perfect Dutch accent when speaking English.
- Focus Group Ending: The original ending, which Sony Pictures wanted the director to use, shows XXXX driving off into the sunset with his new girlfriend. The director secretly recorded the alternate ending, showing XXXX being shot by Sidney to the screening audience and ended up using it based on popular vote, stating "It was not like other American movie endings".
- Prop Recycling: The Duke's severed head is the same prop as used in Elizabeth.
- Reality Subtext: The actor who plays the Duke, Jamie Foreman, is the son of an actual London Gangster, Freddie Foreman, who was an associate of the Kray Twins.
- Star-Making Role: This is the film that put Daniel Craig on the map, which led to him being James Bond.
- What Could Have Been: Guy Ritchie was originally set to direct, but dropped out due to scheduling conflicts.
Trivia / Layer Cake