Actor Allusion: When one cop advises another to kill Hartigan without hesitation, they're quickly dispatched and Hartigan quips "Good advice". In Die Hard, a terrorist who tells John McClane to kill without hesitation is offed, with McClane snarking "Thanks for the advice". Both played by Bruce Willis, lying on his back and shooting upwards both times. Frank Miller even said that he thought of that very scene from Die Hard when he drew that scenario in "That Yellow Bastard". Little did he know…
In the film of A Dame to Kill For, the way Hartigan's ghost talks to Nancy is very reminiscent of Bruce Willis's role in The Sixth Sense.
Awesome, Dear Boy: Some of the cast of Sin City signed on after seeing the test footage which would eventually become the opening scene. In the making-of it's noted that a lot of them had wanted to play Film Noir characters for a long time, such as Bruce Willis. Also, many cast members signed on due to other actors being in talks. Considering the large cast of famous faces, this seems reasonable.
In the past Frank Miller has promised several new stories, including a Hartigan prequel, a Jackie Boy prequel, a story set in 1940, and a story set in the Sin City's founding during the Gold Rush. So far, the only new stories written are the two featured in Sin City 2.
In the back of Lost, Lonely and Lethal (published in December 1996) Miller announced a story called "The Hard Good-Bye" that would feature Nancy teaming up with Marv to avenge Hartigan. The title ended up being used as a Retronym for the first arc while the story itself finally saw the light of day in A Dame to Kill For as "Nancy's Last Dance," 18 years later.
Type Casting: Mickey Rourke as an ugly, down on his luck bruiser with a heart of gold? He was born to play Marv. In fact, when Frank Miller met Rourke, the only thing he wrote down in his notes was, "Met Mickey Rourke — HE IS MARV."