Jodie Foster approached originally Kristen Stewart for the role of Norah, remembering their experience at _Panic room (2002)_ as proof of Stewart's talent, but the actress was committed to the Twilight franchise.
Before Summit Entertainment settled for a release date in Spring 2011, this film had been shelved due to Mel Gibson allegedly assaulting his ex-girlfriend, Oksana Grigorieva.
Jodie Foster says on the DVD commentary that a lot of the studios that passed on the project did it because she refused to change the ending, in which Walter loses his hand. If she had changed it, they would've agreed to finance the movie.
Walter Black: No more muckin' about with tools when I'm not around. It's not safe. Or when your mother's asked you not to. Or at night. Or in a toilet. Or when you're climbing Mount Everest. Or picking your nose. Agreed?