Awesome, Dear Boy: Berry originally said that she did the film because she wanted the awesome experience of playing a woman beholden to no one. However, in an illustration that Hollywood acknowledges the power of this trope, it turned out that she was only saying this for publicity's sake; she later gave an interview saying that she mainly did it because she was under contract (thus beholden to people).
Box Office Bomb: It only brought back over $80 million of its over $100 million budget, making it a spectacularly expensive failure. Interestingly, it was the highest grossing female-led superhero film until Wonder Woman - not a tough competition, but still notable.
Creator's Apathy: There's an interview where one of the producers admitted they couldn't make sense of the clashing back stories of Selina Kyle's character — which has ranged from jewel thief to urban protector to dominatrix. So they decided to just throw it all in the waste bin and rip off The Crow.
Creator Backlash: Director Pitof and his production designer Jean Rabasse disliked the film's plot and script. They had actually suggested another plot which they had thought up together, but execs rejected it for being supposedly "too artistic".
Creator Killer: This film, and the process of making it, killed whatever hopes its director, Jean-Christophe "Pitof" Comar, might've had of breaking into American cinema as a frontline director. Even back in Europe, Pitof has only directed one more film since, and it's a TV movie.
The failure of both Catwoman and Elektra was a major reason that studios became so skittish about female superhero movies. Of course, this has resulted in numerous accusations that it was just being used as a cheap excuse, acting like them both being such awful movies couldn't be a factor in no one wanting to see them. It took the DC Extended Universe's Wonder Woman more than a decade later to eventually prove that a female-led superhero movie can succeed critically and financially.
Likewise, the failure of this film was also one of the reasons for which studios became unwilling to do any more superhero movies focused on villains. Another superhero film centered on a villain would not be made until Sony Pictures released Venom fourteen years later, which was negatively received as well, yet audiences mostly loved it. In the end, it wasn't until the next year that Warner Bros. released Joker to universal acclaim, effectively redeeming themselves from the disaster Catwoman was and demonstrating that bad guys have a possibility of shining on the big screen.
Hostility on the Set: According to insiders, Sharon Stone was difficult to work with for this film, among other reasons because she personally disliked Benjamin Bratt (she had previously vetoed his casting from Basic Instinct 2 claiming he was a bad actor). While shooting a scene, Stone's mobile phone rang, and she nonchalantly interrupted the scene to take the call.
No Stunt Double: Berry did several of her stunts herself, especially regarding her whip play, which she trained extensively to be able to use. In another of the stunts, she suffered an accident during a chase scene and had to be briefly hospitalized.
For Halle Berry in years to come: She famously appeared at the Razzies to accept 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.
Halle Berry: 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.
In addition to Berry, the film also became a big shame for co-writer John Rogers.
This also happened with one of the film's VFX vendors, Tippett Studio, who actually went out of their way to point out that the only effects they did in the film were the cats. They've since furthered their distance from the film by not even making any mention of it on their site.
Averted with Alex Borstein, who loved doing it and asked Halle Berry on Instagram if she remembered it.
As often noted on the web, the film 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.
Screwed by the Lawyers: According to one of the writers, "insane legal issues" prevented Selina Kyle being the main character.
Halle Berry had signed for a sequel, but after all the bad reviews, development on the sequel was quickly squashed. This also made her available for the third X-Men film, X-Men: The Last Stand; she rejoined that series, but allegedly got paid less for her role that go round.
The film also managed the impressive feat of killing off an unrelated series before it could even really begin; a film starring Berry's Die Another Day character Jinx had been in development for the previous two years, but the critical and commercial failure of this film killed that one too.
The film was originally a spinoff from Batman Returns, and would have followed Selina Kyle (intended to be played once again by Michelle Pfeiffer) as she supposedly took on a new enemy during a stay at a resort. The script was written by Daniel Waters and completed in 1995 (ironically, on the same day Batman Forever was released), but both Tim Burton and Pfeiffer dropped out soon after and the film was stuck in Development Hell for years.
Ashley Judd and Nicole Kidman were 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 music video. With no video to promote the single, they instead used "Scandalous" by Mis Teeq.
The scrappedDirect to Video animated spinoff film would've had Patience meeting Selina along with delving deeper in the Egyptian mythology of the film.
Misc. trivia for the film:
This movie managed to become the second comic book movie and the first superhero-themed one to win the Worst Picture Razzie; 2015's Fantastic Four (2015), the infamous attempted reboot of the namesake franchise, became the second superhero film and third comic-book movie 11 years later. The other comic-book movie with a Worst Picture Razzie is 1986's Howard the Duck.
Trivia for the video game:
The Other Darrin: Every actor except for Frances Conroy got replaced by a voice double.
The Other Marty: Halle Berry voiced Patience in the first level but the rest of her dialogue was provided by Jennifer Hale.