The film based on the video game series:
- Actor Allusion: Timothy Olyphant is a well-trained killer with superb situational awareness. This also isn't the first time Olyphant has played a character who broke someone's neck whilst lynching them.
- Actor-Shared Background: During the restaurant sequence, the scene in which Nika talks about owning a squirrel/chipmunk when she was young was actually true for Olga Kurylenko, and the scene was improvised during filming.
- Big Name Fan: Believe it or not, Marxist philosopher and cultural critic Slavoj Žižek voted for it for Sight & Sound's poll regarding the best films of all time. Even the writer of the piece seems confused by this decision.
- Dyeing for Your Art: Olyphant put on 20 pounds of muscle and shaved his head for the role.
- Executive Meddling: The infamous train duel was filmed in a rush after director Xavier Gens was fired over conflicts with the studio.
- Money, Dear Boy: Olyphant has admitted in interviews that he did the film as a means to help pay for his house after Deadwood was cancelled.
- Release Date Change: The movie was delayed from its October 2007 release to late November 2007 to facilitate for the re-shoots.
- What Could Have Been:
- According to a leaked near-final (or even final) script, the Executive Meddling ruined the plot. The script involved Markov, the FSB agent, hiring 47 to assassinate the real president, intending to rule Russia through the president's Body Double loyal to the FSB and sending a Spetsnaz team called back from Chechnya after 47. The intrigue would be foiled by Agent Whittier, who plants a bug on Markov and gives the recording of Markov's conversation with the body double to a Russian general. This also explains why 47 kidnaps Nika: he interrogates her, and she mentions that sometimes the president was Not Himself, hinting at the double's existence early on, leading to The Reveal during the meeting between Markov and the double in the morgue. 47 manipulates Markov into shooting the President during Udre's funeral, and then blows him up anyway.
- Vin Diesel was originally cast as Agent 47. After he dropped out, the first choice to replace him was Jason Statham.
The video game series:
- Creator's Favorite: David Bateson considers Silent Assassin to be his favorite game in the series.
- Defictionalization: Replica "Silverballers" have gone up for bid on eBay.
- Dueling Works: The Hitman series has traditionally gone up against Sam Fisher in the console wars, particularly the first two games.
- Keep Circulating the Tapes: Whereas the other three games in the series came onto Steam in March 2007, a year after Blood Money's release, Contracts remained unavailable on the platform until January 2014 due to a music licensing issue regarding a Clutch song in the mission "Deadly Cargo".
- Mean Character, Nice Actor:
- 47 and Diana on their off-hours.
- There was a bit during the press conference for Absolution where Bateson was asked what traits he shares with 47, and he jokingly threatened to kill the reporters. "I'm very happy, very well-adjusted."
- Name's the Same:
- Production Foreshadowing: of Deus Ex: Human Revolution. The Anatomy Lesson of Dr. Nicolaes Tulp makes a brief appearance in the opening of Blood Money's "Curtains Down".
- What Could Have Been: Iron Galaxy Studios bet on the right to make Hitman GO and lost, according to CEO Dave Lang, although he also states that the end result is probably way better than whatever they would have come up with.
The Game Show:
- Keep Circulating the Tapes: The show hasn't been seen since its cancellation, primarily because the "fact videos" were licensed for one showing each and Wolpert hasn't been able to negotiate new terms.
- What Could Have Been: Jay Wolpert hosted the pilot. When the series was picked up, NBC requested that Wolpert drop 20 pounds and wear a toupee. Wolpert balked and Tomarken was hired to host.