The film stayed very close to the book. It moved a little quickly bc of the time constraints, and if you have not read the book, I STRONGLY recommend it first. It stayed so true to the book that if you haven't read it you will get confused about halfway into it bc much of the relationship growth was cut from the film.
I originally had my doubts about the casting of several roles (Bella, Rosalie, Esme) but these actors delivered perfectly! The movie stills released before the film didn't do them justice. I was sad that there wasn't very much interaction with the Cullen family, and so we barely got to meet them before the climax. Emmett was classic, and became my favorite character.