When Edward and Bella are in the taxi in Brazil, he has his wedding ring on. In the shot when he kisses Bella in the street, the ring is suddenly gone.
Rob Pattinson's butt crack was showing during the filming of the lovemaking scene with him and Kirstin Stewart and so the crew had to recut the scene and they "cut the crack out and painted over it." In PG-13 movies you can show butt cheeks but not butt cracks according to Rob Pattinson. (Ellen show Nov 18, 2011).