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Corrected entry: When Chigurh shoots the wall in the motel room in Del Rio we see an example of the pellet pattern produced by his shotgun at a distance of about 10 feet. Later Chigurh shoots Stephen Root from a distance greater than 10 feet, so the pellet pattern should have been even larger. This implies that the window behind Root should have been broken by the pellets that did not hit him.

CodeCat

Correction: Although it is not mentioned in the movie, the book explains that Chigurh was using small (10) shot so that the window would not be broken.

CodeCat

Correction: In the hotel scene, Chigurh is not using the suppressed shotgun. He is using what appears to be an MP5 with a suppressor. If you look at the windshield of the truck, there are single bullet holes instead of a pattern. Then when Moss shoots at Chigurh in the street, and Chigurh flees, Moss picks up the MP5 that Chigurh dropped.