 The final duel between Little Wolf and Red Shirt was shot on the day  that President John F. Kennedy was assassinated in Dallas, Texas.  Though legends say that Ford, so saddened by the death of the first  Irish president of the nation, mourned his death by halting the  shoot on that day, production documents actually shows that it was  the only scene to be shot on that day, and they moved from Utah in  the afternoon as originally scheduled.