spoiler alert!

here are some spoilers from moviesonline:

- Bella is a DareDevil in the film in comparison to the book.
- Although Edward is supposed to appear to Bella as a voice only the filmmakers have decided to have him in the film as a ghostly figure instead of just a voice. No doubt to get him more screen time for the fans.
- In the books apparently Laurent is destroyed by the wolves, where as in the film he will fight them.
- lastly in the book Edward says he will turn Bella into a vampire if they marry. Obviously to keep things more 'teen' they have decided to remove the marriage angle.

and some interesting facts from mtv (click to read full article):

"Kristen [Stewart] and Taylor [Lautner] had to lobby to get this one scene in the film that wasn't originally in — and I am forever indebted to them for that," revealed Mike Welch, citing a beloved moment from Stephenie Meyer's "New Moon" novel. "There's a scene that's in the book, the three-way date between Jacob and Bella and Mike, where Mike ends up getting sick, and it's just very awkward."

As for how physically ill Welch's Mike Newton gets in the comic-relief scene, he said we shouldn't expect projectile vomit or anything. "We're talking a little bit," he laughed. "A little sick."