Factual error: When the expedition is unloading from the helicopter, it shows a view of the lady with the helicopter blades about to cut her head off. It then shows a view of the helicopter, perfectly upright, and people are still jumping off! She then gets up and crawls to the rock wall, which in a full view you can see that it is at least 15 feet away from the edge. The helicopter blades follow her, perfectly parallel with the ground. It is physically impossible - the helicopter would have to be underground for this to happen.
Factual error: When Chris O'Donnell is inside his tent talking on the radio with his trapped sister, they're talking like they're on the telephone, like if they can interrupt each other at will. On a radio, you can only hear the other guy after you've stopped talking. That conversation could never have taken place like that. Besides, they never press the "send" button.
Factual error: I'm a skydiver and when we fly above 20,000 feet it is mandatory to have oxygen masks on. Our friend Billy flies in at base camp at 23,000 feet, stays there for only 2 days and races off for the summit, without acclimatizing or wearing oxygen.
Factual error: Throughout the movie they throw around their bags, shake them around and throw themselves onto them with the nitro strapped onto the bags. They should have got blown to pieces at least a dozen times. It's only when it's time to pour the nitro in the snow to blow a hole they are careful.
Factual error: When one of the crazy brothers and a Sudanese guy are climbing the mountain they come to a place where the Muslim guy starts praying. The way he prays is wrong. During a Muslim prayer your hands are raised to your ears for a few seconds and lowered again, but the guy keeps his hands raised and prays. Plus you cannot talk while you're praying or look away as the guy does to motion towards the nitro.
Factual error: When the photographers are hiding in the blind, shooting the bears, they have a table sitting behind them covered in extra gear. All the extra film that's sitting around is Kodak Max 400, a supermarket film, and nothing that a professional wildlife photographer would be using.