When the climbers reach their first camp, the guide tells them that they will pitch two tents, but only take one tent up the mountain the next day. When they reach their second camp they have two tents pitched as well.
The characters played by Homolka, Rains, and Hardwicke are too old or unfit for that kind of climb.
When scaling the last bit of the peak near the end, it's obvious that studio lights were being used as there are multiple shadows going in multiple directions of Glenn Ford.