Continuity mistake: During the paper cut scene, when Bella is thrown against the table, there are 5 vases of flowers and 3 sets of candles. After she hits the table she lands against one of the vases and knocks the 2nd one to the floor, but the next shot shows only one vase left upright.
Continuity mistake: When Bella is in the parking lot at school in the beginning, Edward walks toward her. Bella's hair is neatly pulled off to the side. When he leans in for the kiss it is suddenly stuck to her forehead, and when Edward tells her Jacob wants her, it's suddenly back to normal.
Continuity mistake: Right before Jacob comes through Bella's window, it shows her sleeping and "dreaming" of Victoria coming to get her. If you look, the camera really focuses on the dreamcatcher and how it's hanging above her on the bedpost. It is hanging off to the side of the middle hump. Immediately, Jacob comes through her window and focuses in on the dreamcatcher hanging on the bedpost which is now neatly hanging in a completely different way, perfectly laid over the center of the bedpost.
Continuity mistake: When Bella goes to the Cullens' house for her birthday party, Alice takes the new camera that Charlie got Bella and takes a picture of Bella and Edward. But when Bella prints out the picture and puts it in her scrapbook, it looks nothing like the picture Alice took. Given we see the entirety of her visit from start to finish, there was no other opportunity for a different photo to be taken.
Continuity mistake: Bella just went back to the meadow and is talking to Laurent. Throughout the whole scene in the meadow, her hair changes on her right ear. It goes from behind the ear, to fully covering the ear, to half covering the ear, and back and forth between those. And in the beginning, her hair is near perfect, but by the end, her hair is more wispy and not-so-matted to her head.