The scene in which the horse is cut into segments suspended in glass cases is inspired by the work of British artist Damien Hirst (e.g., the installation "Some Comfort Gained from the Acceptance of the Inherent Lies in Everything").
Jennifer Lopez wanted the costumes to be comfortable to wear. Costume designer Eiko Ishioka advised Lopez to feel uncomfortable because her character, Catherine, is "tortured".
Director Tarsem Singh asked Tara Subkoff during her interview if she could swim, to which she responded that she could and that she had been a lifeguard. It turned out that she could not go under water without holding her nose. Singh would have switched her role with Catherine Sutherland, but it was too late and there was not enough money or time to re-shoot.
When Catherine is at home, the TV in the background is playing Fantastic Planet. Scenes from the movie are shown out of order and the soundtrack does not match what is being shown.
Just before water pours on Julie, the monitors around the room show her eating (at least, holding food). But when the camera cuts straight to her, she isn't holding anything (error caused by deleted material).
What are the differences between the US-Theatrical version and the Director's Cut?
A
Prior to its US cinematical release the movie got cut to receive a R-rating. Several scenes showing Vincent D'Onofrio dangling from numerous chains and masturbating on his already dead victim were cut. Those scenes were included in the European versions of this movie and can be found on the DVD releases in Germany or Britain as well. A detailed comparison between both versions with pictures can be found here.
Q
Where can I find more information on the movie?
A
The Cell Enhanced Script Presentation....includes over 200 screenshots in sync with the story and highlighted dialogue.