All-Star Cast: Not that it helps in this particular movies case any...
Genre-Killer: Along with Elektra, its failure put Hollywood off films about female superheroes, or female action heroes in general, for a long time. In fact, nearly a decade later, despite comic-book movies being on a massive popularity surge and fans chomping at the bit for a female superhero movie, the studios are still playing it very cagey. DC will have Wonder Woman appear in two other movies before possibly getting her own, and Marvel, despite having a proven popular super-heroine in their films with Black Widow, has no plans to have her lead her own movie at all.
"First of all, I want to thank Warner Bros.. Thank you for putting me in a piece of shit, God-awful movie[...] It was just what my career needed."
The context for that quote: She said it at the Razzies as she accepted her award for "Worst Actress". The entire time, she was holding her Oscar for Monster's Ball in the other hand. Publicly reminding people that she is usually a good actress; the movie was just THAT bad. Razzies founder John Wilson even remarked that after seeing this, he expects Berry to run for the Oscar again.
Recycled Script: As often noted on the web, bears a striking resemblance to The Crow. In fact, the movie's first trailer was alleged to have the same narration script as The Crow's own trailer - only changing the respective animal.
The romantic basketball game between Patience and the detective was lifted verbatim from Daredevil.
Ashley Judd was originally considered to play Patience, and the character's surname was originally Price.
An early draft of the script had Patience becoming Catwoman to avenge her mother's death.
Originally, "Outrageous" from Britney Spears was supposed to be the single from the movie. However, Britney injured her knee while filming the video. With no video to promote the single, they instead used "Scandalous."
Trivia for the comics
Creative Differences: Ed Brubaker reportedly left his critically-acclaimed early-2000s run writing Catwoman's solo title in protest at the replacement of early artists like Cameron Stewart and Rick Burchett with the much more Fanservice-heavy work of Paul Gulacy. An interview in which Gulacy described Selina as "slutty" and the idea of her not being primarily a fanservice character as "absurd" may have been a final straw.