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.
When Alice jumps over the staircase in school to wish Bella happy birthday, between shots during the scene the positioning of the decorated scarf around her neck varies.
After Bella awakes from the first nightmare, we see her Romeo and Juliet book on the pillow beside her. When Charlie brings in her presents the book is gone, but then reappears on the pillow between shots.
In the scene where Bella is in the meadow talking to Laurent, Bella’s hair is at first straight and then in the next scene it is wispy and pushed back and then it is straight again.
Bella goes to Italy to save Edward. Alice drops Bella off – when Bella gets out of the car to ask where Edward will be, first you see Bella in front of the car door, then she is suddenly behind the car door.
When Jacob first shows off his tattoo, it is up at the top of his shoulder. Then when he is in the forest at the end with Bella and Edward, his tattoo is about 2 inches further down his arm.
In the scene where Jacob is talking to Bella on the beach about Victoria, his shirt starts off as a dark gray colour, then it changes to a brown colour. It does this a few times during the scene.
When Bella and Edward enter the chamber with the Volturi, they change which sides they are holding hands on. This also happens when they leave, except it goes from arm on waist to hand holding.
When Alice is driving Bella to the Volturi, she is wearing a headscarf and sunglasses. During the scene the way the headscarf is tied changes; the size and shape of the knot (and the colours on the knot) are different.
When Bella is at the cafeteria table with Mike, and he is asking her to a movie, her hair keeps moving from behind her ear to hanging in front, and back again.
Source : Movie Mistakes