Strother Martin was originally scheduled to play the part of Otis Hazelrig, but passed away before the film could be made. However, a few lines of script suggested by Martin remained in the final film, but spoken by Charles Durning, who eventually played the part.
Charles Durning did most of his own stunts of the climatic chase scene when he's running away from the tractor. A double can be seen for a few shots with darker hair.