 While filming the "town in chaos" shot, the Cooper Brothers were  instructed to torment the townspeople, and the townspeople were told  to act accordingly. They ran around and flailed their arms in the  air and looked pretty distressed. After the take, the actor playing  the Indian said he accidentally turned his back to the camera  revealing the blue Speedo he wore underneath the loin cloth/car  washing chamois. Another take was rolled off to cover for this  error, but during the shot, the DP started to chuckle at what he was  viewing through the lens. It turned out that Brett, the man playing  the Indian, decided to do away with the Speedo entirely, allowing  him to expose his backside to the camera. The director kept the  shot, claiming that it added to the "authenticity" of the film.