I loved Heath and I don't know if I can go see this although I kind of feel like as a fan I really should. We'll see. Is it true there is video somewhere of Nicholson hearing about Heath's death by a reporter and saying, "I warned him."?
On edit, it is true.
http://www.foxnews.com/story/0,2933,325208,00.html
On edit again, I recall Brad Pitt had a lot of trouble playing Louis (Interview with the Vampire) because the character was so brooding and the film was shot in the dark.