Near the end of the film, when Obi-Wan, Qui-Gon, Amidala, and the guards are fighting the droids, the camera cuts many times to R2, and Anakin. Well, about two or three times the camera cuts to them, R2 has been flipped. You can tell he's been fliped because of the thing that R2 can project pictures and maps of the palace is on the left of the red light thats on him. It's suppost to be on the right of the light.