Dawn Soler, the musical supervisor for the film has said in an interview that Axl Rose intended to have the unreleased Guns N' Roses song "This I Love" in this movie but for some reason the director didn't use the song.
The title is derived from William Shakespeare's "Hamlet" (Act 3, Scene 1): "To sleep: perchance to dream: ay, there's the rub; For in that sleep of death what dreams may come When we have shuffled off this mortal coil must give us pause..."
The last scene in which Annie is seen alive, sitting on a bed writing in her journal, there is a triptych by Early Netherlandish painter Hieronymus Bosch on the wall behind her. The painting, called "The Garden of Earthly Delights", features three panels. The first being Bosch's interpretation of Heaven, the second Earth, and the last Hell.
The "Hell" scenes were shot on the decrepit, rusted hulk of the Essex class aircraft carrier USS Oriskany (CV-34). The ship was later sunk to make room for an artificial reef on 17 May, 2006. The "Hell" scenes were shot at the Alameda Naval Air Station in an indoor swimming pool surrounded by blue screen so that the FX could be later added in. Extras spent two 12 hour days in the water as Ghouls.
One of a small number of films shot on Fuji Velvia (RVM) film stock. Velvia is a type of film used most frequently for still photography of landscapes and other subjects because of its very high color saturation. It is only rarely employed for cinematography, usually when special effects are required.
The original score was composed by Ennio Morricone. However, Morricone's score was rejected after some initial screen tests. No explanation for the rejection has ever been given by the director or producers.