I hate when movie is so different from the book!! I realize movie have time restrictions, but I felt the movie lacked so much of the book! I really didn't see his internal struggle with killing the androids, the animals held no importance, either did Mercer. If I hadn't read the book..the unicorn dream would have been even more out of place. The affair with Raechel meant less when he wasn't married. The only hint that he maybe an android is the shot of his eyes reflecting like Raechel's. The movie definetely made the androids out to be "more human", more emotional, wanting to live longer.
But really, why change the Rosen Corporation and JR's name?