Continuity mistake: In the scene where Edward goes back to the highway from rescuing Bella. We see he stops the car when he turns, when the camera changes we see the area around them moving but we never heard or see the car accelerate.
Continuity mistake: As Edward and Bella are dancing on the gazebo at prom, the other two couples leave the gazebo. The first couple who leave walk over to the stairs and start walking down them. In the next shot they're still walking to the stairs and then begin to descend them again. (01:46:00)Hamster
Continuity mistake: When Bella says, "Why did you hate me so much when we met?" Edward's face is very close to hers and his right hand is placed with the palm on a branch. In the next shot, his face is further away, and now it's only his fingertips which are touching the branch. (00:52:30)IdaMarieSmithLarsen
Continuity mistake: Just before the Cullens begin to play baseball you see Edward running away and beginning to turn around to look back at Rosalie while he is running. But in the next shot you see him walk with his back turned to "us" and then turning around to look at Rosalie. (01:16:10)IdaMarieSmithLarsen
Continuity mistake: In the ballet studio fight scene, Bella grasps an injured right leg with her left hand. When Bella is in the hospital, the cast is obviously on the left leg which is under the blanket-the silhouette of the leg is straight and much larger than the right leg, which is thinner, flexed and has skin exposed at an area which would have been covered had it been in a bandage or cast. But when she and Edward go to prom, the injured leg is again the right leg, which is in a cast.