Continuity mistake: After Kim Darby declines the coffee, John Wayne puts his empty plate in the middle of the table. Immediately in the next shot, the plate is back in front of him with some scraps of food still on it.
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Ned Pepper: What's your intention? Do you think one on four is a dogpaw?
Rooster Cogburn: I mean to kill you in one minute, Ned. Or see you hanged in Fort Smith at Judge Parker's convenience. Which'll it be?
Ned Pepper: I call that bold talk for a one-eyed fat man!
Rooster Cogburn: Fill your hand, you son of a bitch!
Trivia: The famous shoot out between Duke and the outlaws in the valley was done twice. The long shots and most of the riding was done for Duke by his stunt double Chuck Roberson. Duke came back an did all the close ups on a horse being pulled by a camera.
Answer: The mountain in the background appears to have two vertical grooves down the surface facing the camera. Those grooves are far too wide to be ski trails. They are simply a natural part of the mountain. Mountains are subjected, over hundreds of thousands of years, to a variety of natural forces, such as wind erosion, water erosion, tectonic shifts and earthquakes, just to name a few. These cause mountains to have irregular shapes, and irregular surfaces.
Michael Albert