Trivia about Batman: Year One.
- Batman: Year One was almost adapted as a live-action film to be directed by Darren Aronofsky from a screenplay by Frank Miller. Warner Bros. canned the project in favor of Christopher Nolan.
- Planned for release in the US on the same day as Batman: Arkham City.
- In addition to voicing Barbara Gordon (James Gordon's wife), Grey DeLisle voiced (uncredited) the role of Vicki Vale, who was not in the original graphic novel, although she is mentioned in one of the newspaper articles in the book's first pages as being a "cutie clepto". Vicki replaced several television news reporters used in the original story.
- Hopper's diner is seen frequently in the movie, and is named for its resemblance to the diner in "Nighthawks", a painting by Edward Hopper.
- The Painting of the Clown in Commissioner Loeb's Office, foreshadows' the appearance of the classic Clown psychopath, the Joker, in a sequel or just in the general mythology that the comic books have set up.
- Bryan Cranston originally turned down the part of Jim Gordon because he thought this project was based on Batman. He accepted after he read the script.
- Quite a few scenes and shots from the movie, that were in the original graphic Novel, made it into Christopher Nolan's "Batman Begins" (2005). One notable example include the appearance of the army of Bats at the location where the police have trapped Batman.
- Benjamin McKenzie, the voice of Batman in this film, later goes on to play Detective James Gordon in Fox's "Gotham".