Ain't It Cool News (http://aint-it-cool.com/) has two spoilerific reviews of the movie. They saw two rough but full versions of it. It explains the two heads thing a little and talks about how the movie deviates from the book. And remember: the book in no way resembles the radio shows which in no way resembles the TV show. The author talked about that in the intro of one of his books. I suppose that fits in nicely with the crazy universe he created!