Continuity mistake: When Bella is in the hospital, in the close-up of her face, the breathing tubes are right by her eyes, but when the shot is farther from her face, the tubes are on her cheeks.
Continuity mistake: When leaving from the baseball scene, Emmett's jeep goes from being dirty on the sides with mud from the tires, to being clean.
Revealing mistake: When Bella sees Waylon's body being gurneyed onto the ambulance, Bella has a flashback of Edward's eyes being black. In the short snippet, you can see the rim of the contacts he's wearing.
Continuity mistake: In the hospital, after the 'almost' car crash when Edward saves Bella, she has a blood pressure cuff on her arm. You can see the nurse take it off. She has it off for a while, but then it reappears on her arm in one shot, just as her dad says "you can kiss your licence goodbye".
Continuity mistake: When Bella enters Biology class and talks to Eric about the prom, she starts to walk, then pauses to look across the room towards Edward. In this shot, the Armadillo is not on the shelf, only what looks like a peice of paper is hanging there. The Armadillo appears on the shelf only after she has sat down at her desk and Edward moves the microscope towards Bella saying, "Ladies first".
Continuity mistake: After Edward saves Bella from being crushed by the van, while he is holding her, Bella's hair is outside of her jacket covering up her hood. When the shot changes her hair is tucked beneath the jacket and the hood is visible. When the shot changes back, her hair is covering up her hood.
Continuity mistake: During the hospital scene, when Edward is "sleeping," his head goes from from leaning on one shoulder to suddenly on the other shoulder in the very next shot.
Continuity mistake: When Edward reveals what he is to Bella, the button down shoulder epaulet on his jacket goes from being unbuttoned to being buttoned, throughout the scene.
Continuity mistake: When Bella looks up "cold one" on Google, she clicks on a result that says, "The Cold One: Apotamkin." But when she clicks on it, the title on the top of the page says, "Apotampkin: The Cold One." A p is added before the k in the second one.