Halle Berry broke her arm filming a scene with Robert Downey Jr. in the hospital interrogation. Downey was supposed to grab her arm and twist but twisted too hard and the arm snapped. Production was halted for eight weeks.
The Anima Sola (aka 'Lonely Soul') tattoo, an important plot point, is a medieval image depicting a soul, often a female, suffering in the flames of purgatory. Her arms, on which hang broken chains, are lifted towards heaven, indicating that her suffering is over and she is about to rise to heaven. It is most prevalent in Catholic cultures.
The title of the film, Gothika (can also be spelled gothica), is an unofficial term used to describe a form of purgatorial state of mind, a situation in which someone sees or feels things that no one else does and those who don't think those who can are crazy. They simply have a connection to the supernatural world.
Although it was not the first Dark Castle Entertainment horror film to be critically panned, and wasn't the last, it was the first, and still is, the highest grossing film to be released from the production company with a $141 million gross against a $40 million budget.
Halle Berry and Robert Downey Jr. both star in superhero film adaptations, specifically Marvel comics properties. Halle Berry in the X-Men franchise as Ororo Monroe / Storm and Catwoman (2004) as the titular character and Robert Downey Jr. in the Marvel Cinematic Universe as Tony Stark / Iron Man.
Halle Berry was listed as a potential nominee on the 2004 Razzie Award nominating ballot. She was suggessted in the Worst Actress category for her performance in this film, she failed to receive a nomination however. The very next year though, she got a nomination for Worst Actress in the film Catwoman (2004) and won.
The trivia items below may give away important plot points.
This film was the first time John Carroll Lynch had portrayed a serial killer. The second time was when he played the suspected Zodiac Killer, Arthur Leigh Allen in the film Zodiac (2007). The third and fourth times where when he was cast as Twisty the Clown and John Wayne Gacy on the fourth and fifth seasons of the television series American Horror Story (2011).
The filmmakers attempted to have the film end back at the prison, including having a prison riot where Sheriff Ryan is killed by the inmates, but no one could figure out, story-wise, how to get Miranda back there, since she had already escaped from there twice earlier in the film. Director Mathieu Kassovitz ultimately decided that getting the characters out of the hospital for the climax was a good idea.