Corrected entry: Books just finished a gun battle in the bar, and was shot by the bartender. Gillam runs in, grabs Books' gun and shoots the bartender dead with three more shots. Then he looks at the gun, and you can clearly see all the bullets still in the cylinders of the revolver.
Corrected entry: Books tells Doc Hotstettler that "ten days ago, in Crede, Colorado......" and that he got on his horse and took off to find the Doc in Carson City, Nevada. That is about 600 miles away, which would mean riding 60 miles a day on horseback for a man dying of cancer and having trouble sitting without his "fancy pillow".
Corrected entry: In the scene where the two bad guys try to ambush Books while he sleeps, Books kills the first guy with a couple of gunshots, and the second guy waits a few seconds, then shoots at the bed again, as though no shots had been fired. In reality, he would have run away or shot at Books standing in the room.
Corrected entry: When Books and Mrs. Rodgers are riding in the buggy after meeting up with Mike Sweeney, you can see the address numbers on the walls of the buildings they pass. There were no addresses on the walls in 1901.