David Fincher - Fight Club lyrics

General What are the main differences between the movie and the book? How do I understand the Movie? Characters Protagonist (Edward Norton): What is the name of the protagonist? What is the reason for his Dissociative identity disorder? Why is he going to the support group? Who is Jack? Tyler Durden (Brad Pitt): What is the first time that Tyler Durden appears? How many jobs does Tyler have? Marla Singer (Helena Bonham Carter): Why is Marla going to Support groups?