When Batouche spots the Cree and Sioux following, he sees them by looking down from a high point. However, when O'Rourke looks at them through the binoculars he sees them from front on, at ground level.
Shelley Winters asks the Mountie guarding the jail in Fort Walsh, Saskatchewan how far the fort is from Montana. The guard answers "the border is about 18 to 20 miles south of here". The U.S. border is about 40 miles (65 km) south of Fort Walsh.