appear in one of the studio's future films for a smaller salary. Norton later satisfied the obligation with his role in the 2003 film The Italian Job. In January 1998, 20th Century Fox announced that Pitt and Norton had been cast. The actors prepared by taking lessons in boxing, taekwondo, grappling, and soapmaking. Pitt voluntarily visited a dentist to have pieces of his front teeth chipped off so his character would not have perfect teeth. The pieces were restored after filming concluded. Fincher's first choice for the role of Marla Singer was Janeane Garofalo. While Fincher initially stated that she turned it down because she objected to the film's sexual content, in an interview in 2020, Garofolo revealed she did accept the part but was dropped because Norton believed she was poorly suited to the part. The filmmakers considered Courtney Love and Winona Ryder as early candidates. The studio wanted to cast Reese Witherspoon, but Fincher felt she was too young. He chose to cast Bonham Carter based on her performance in the 1997 film The Wings of the Dove. Writing Uhls started working on a draft of the adapted screenplay, which excluded a voice-over because the industry perceived the technique as "hackneyed and trite" at the time. When Fincher joined the film, he thought that the film should have a voice-over, believing that the film's humor came from the Narrator's voice. He described the film without a voice-over as seemingly "sad and pathetic". Fincher and Uhls revised the script for six to seven months and by 1997 had a third draft that reordered the story and left out several major elements. When Pitt was cast, he was concerned that his character, Tyler Durden, was too one-dimensional. Fincher sought the advice of writer-director Cameron Crowe, who suggested giving the character more ambiguity. Fincher also hired screenwriter Andrew Kevin Walker for assistance. He invited Pitt and Norton to help revise the script, and the group drafted five revisions in the course of a year. Palahniuk praised the faithful film adaptation of his novel and applauded how the film's plot was more streamlined than the book's. Palahniuk recalled how the writers debated if film audiences would believe the plot twist from the novel. Fincher supported including the twist, arguing, "If they accept everything up to this point, they'll accept the plot twist. If they're still in the theater, they'll stay with it."