The major himself rides toward the fort, climbs the wall, and finds all the soldiers dead at their posts.[The entire outdoor set was from the filmWestworld (1973).]This was Brooks"" secondmajorfilm - his debut film wasThe Producers (1968).Gig Young was originally cast in the role as The Waco Kid, and Dan Dailey was once considered.The role of the sheriff was originally designed for Richard Pryor (one of the film""s screenwriters), but he was considered too controversial at the time.Dean""s warning about their doomed enterprise:Sister Briony: She has violent pains in her joints, a boil on her finger, and headaches..." When she tried to flee outside, she found herself trapped inside the locked, dilapidated house with a duplicate entrance hallway.