Filmmaker Magazine has an interview with "A Scanner Darkly" director Richard Linklater in which he talks about the making of his upcoming new movie. Thanks (any guess who it is? :p) to ChrisB. Below is a short passage from the interview, to read the whole thing, click here: THE SCHIZOID MAN
Did your actors have much knowledge of Dick’s work before they joined the project? Was Woody Harrelson, for example, a fan?
I don’t think he [knew Dick’s work], actually, but he liked the script. Winona, her dad knew Philip K. Dick. She had letters from him, and she brought a lot of knowledge to the table. Keanu is a total workhorse who did tons of research. He and I would always refer to the book and Dick’s letters. I would say Woody and Rory didn’t overthink it too much. Downey definitely has to dig in on an intellectual level, as does Keanu, but Winona probably had the most knowledge.