When Red Cloud attacks the soldiers with their new rifles, the weather changes; when Red Cloud is getting ready to attack, there are dark storm clouds behind the Indians; in the next scene, minutes later, there are only a few scattered clouds in a mostly sunny sky.
When Dan (played by Tom Tully) gets shot with an arrow, it hits the side of his left pectoral. Later when they show him, it's sticking straight out front.
Although now shown on TV under its original Tomahawk title, the film was released in the UK as the "Battle of Powder River". This is factually incorrect as the events portrayed took place at Fort Kearny in Wyoming in 1866, as part of Red Cloud's War, not the Great Sioux Uprising in Montana, in 1876. Confusion arises because the locations of both conflicts lie on the Bozeman Trail within the Powder River Basin/Country. Events between 1866 and 1868 are sometimes referred to as the Powder River War.
When Dancy is shot and killed by an arrow, padding can clearly be seen beneath his shirt.
Julie wears 1930s style wide-legged pants instead of 1870s style trousers.