As each sequence of this film was shot separately, new cast members were added and incorporated in the stories throughout the production. In many cases separate footage was composited in post-production to look as if it were all shot the same day. For example: Marv (Mickey Rourke) takes Wendy (Jaime King) to Nancy’s (Jessica Alba) home. Alba had not been cast yet when Rourke and King shot the scene; her footage was added in later. The same is true of the scenes between Marv, Cardinal Roark (Rutger Hauer) and Kevin (Elijah Wood), as Hauer and Wood were cast after Rourke had shot his scenes.

Originally, Roy Batty (Rutger Hauer) was to have a lengthy monologue just prior to his death, as written by David Webb Peoples. Hauer felt this didn’t help in creating any dramatic impact in the scene, so he removed much, keeping the pieces he liked, and then added the last two lines, “All those moments will be lost like tears in rain. Time to die.”

Director Ridley Scott and actor Harrison Ford had disagreements about the script almost from the very start. Ford hated the voiceover which Scott was proposing and he was against the idea that Deckard may be a replicant, feeling it undercut the human story of Deckard discovering his lost humanity (Rutger Hauer agreed completely with Ford on this point). According to Ford, Ridley Scott and he agreed prior to shooting that Deckard was not a replicant, but then Scott went and shot it to imply he could be, which disappointed both Ford and Hauer.