Dans une interview donnée dans un journal (sauf erreur, le Yale Herald), le 8 octobre 1999, l'acteur Edward Norton s'exprimait sur son rôle dans Fight Club dans ces termes:
YH: How did you prepare for Fight Club?
EN: ...Brad and I made a decision together about how we were going to take that on. We decided together that I was going to get very thin. It's almost a junkie metaphor. This guy is an unreliable narrator in the sense that he's saying "you became carved out of wood and you felt powerful" and yet his body's disintegrating and he's bruised and shattered. And Brad made the decision to go the opposite way because Tyler is the way my character sees himself. Brad got progressively bigger throughout the movie, he bulked up and got huge and tan and beautiful while I became Gollum.
(et avant l'intervention de P.Jackson... il a de bons classiques ;)