Walter Salles Talks About Kristen with TC Daily Planet
Talk about the cast..
So other casting took place very early on in 2006-07, and the film was almost green lit by 2008 until the economic crisis interrupted and it affected independent film and funding was completely blocked. It took us three more years to put this all together and by then, the actors we had selected had become known for other films. [..] Kristen Stewart was invited to be in the film when I saw her Into The Wild in 2006, and I had no idea the Twilight saga was about to dominate, but she remained closely tied to it for many years. She did say she was thankful it didn’t happen around filming the Twilight films; she had read On the Road and understood Marylou's character, but also said that it would had been hard for her to get all the layers right for her character since she wasn’t mature enough.