After the scene where Natalie Portman gets clawed by the beast (when she's on top of the tower, in the ring with all the 'bees') she has three bloody claw marks on the back of her back. At this point she seems to have a hard time walking. Later, when she's at the tower where Dooku and Anakin (and Yoda) are, she turns around (so that her back is facing towards the camera) and the marks are gone and she's walking fine!