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The scene that Quentin Tarantino directed is the drive to the pits scene in which Dwight (Clive Owen) talks with a very dead Jackie Boy (Benicio Del Toro). When Tarantino insisted on a real car being built for the shooting, Robert Rodriguez told him that it would be easier without one. After shooting a few takes with the real car, Tarantino realized his friend was right. Tarantino also came up with the idea of Jackie Boy's slit throat affecting his speech and Dwight speaking his internal monologue rather than dubbing it in later.
The swords used by Miho (Devon Aoki) in this movie are the same ones used by some of the Crazy 88 in Kill Bill: Vol. 1 (2003). That movie's director, Quentin Tarantino, had been keeping them in the back of his garage.
Because of the way the movie was shot, Mickey Rourke (Marv) and Elijah Wood (Kevin) never met until after the film was released.
Robert Rodriguez has said that he does not consider this movie to be an adaptation so much as a translation. This is why there is no screenwriting in the credits. The only mention of writing is Frank Miller as the creator of the graphic novels.
Guest director Quentin Tarantino directed the scene involving Dwight (Clive Owen) and Jackie Boy (Benicio Del Toro) in the front of the car before Dwight is pulled over by a police officer.
Originally, Robert Rodriguez didn't plan for Benicio Del Toro to wear make-up, but Del Toro insisted on it. Tarantino later commended the make-up being so good that "people actually forget that's not what Benicio looks like."