Twilight: Book vs Movie

Book vs Movie

Aspect Book Movie
Edward's Vigilante Past Edward tells Bella how he used to hunt and kill criminals. Edward doesn't tell Bella until much later in the movie series.
Bella's Lullaby Edward mentions that he wrote this song for Bella. It's never stated that the song Edward plays for Bella is her lullaby. However, the song is reused pretty often throughout the movie series.
Alice and James James hunted Alice when she was human. In order to save her life, someone turned her into a vampire. Alice's backstory is left out of the movie.
Bella's Friends Bella spends much more time with her friends, instead of focusing mainly on Edward. Bella's focus is mostly on her relationship with Edward.