At the end of the movie, after the Indian fight ends, Stewart fires at Granger from under a slanted rock. Granger looks up and sees Stewart now running up between some rocks from his previous position. As Granger chases him, Stewart is under the same slanted rock as he fires at Granger again.
Early, when the stage coach stops because of the dead lineman up a pole . . . to make room for the body, the two barrels of whiskey on the roof of the stagecoach are dumped overboard. In the next long shot of the coach, the barrels are still up top but in the following closeup shot, they are gone.
Even though the top-billed star is in fact "Jock" Mahoney, in the opening credits he is listed at "Jack" Mahoney.
At approx. 19:38, the telegraph line was referred to as a telephone line. This was supposed to have taken place shortly after the end of the civil war, which was 1865. The telephone was not invented until 1875 and the first telephone was not installed until 1878. The golden spike connecting east to west was driven in May of 1869 in Promontory, Utah.
In the final battle between the railroad crew and the Indians at the end of the movie, when the Indians are finally driven off and turn away to ride off, the firing from the railroad camp immediately stops, the Indians at the front wheel their horses around and begin galloping in the opposite direction away from the camp, and after several strides, suddenly two Indians closest to the camera pitch headfirst off their horses like they'd been shot, only there is no more gunfire.