Bill Munny: You better bury Ned right, and don't go cuttin' up... Nor otherwise harm no whores, or I'll come back and kill every one of you sons-a-bitches.
In the jail scene, Gene Hackman is reading from a book. When he turns the book too far towards the camera you catch a glimpse of his lines on brighter white paper attached inside the book.
The movie is supposedly set in early summer (July 4th and thereabout) yet autumn leaves, and at one time a morning snowfall, are seen throughout the film. The movie was actually filmed in southern Alberta during September and October.