“The beginning of the casting of this movie was—over one weekend, I was talking to Jennifer Aniston about movies, and actors that she had worked with that she just loved. Jake Gyllenhaal was one of them and Mark Ruffalo was the other one. And she was telling me how unbelievably talented these guys were. When we finally sorted out how we were gonna shoot this movie, it sort of struck me, that I really love The Good Girl and I really love Donnie Darko and I thought Jake would be perfect for Robert Graysmith.”

David Fincher, Zodiac Commentary