There was a woman named Muriel Gray who produced and starred in a series called "The Munro Show" for STV (Scottish Television) in the early 90's, in which she would take a camera crew up one of Scotland's famed "Munros" (hills which are over 3000 feet high, according to the original classification by Sir Hugh Munro, after whom they are named).

In the sort-of-but-not-quite-a-companion book, My First Fifty, she describes how they climbed one peak, lugging all sorts of camera equipment and other production gear, but for some weather-related reason, they were unable to complete filming. (I forgot whether the weather prevented them from reaching the summit, or merely prevented them from filming.) They dragged all the gear back down to the base of the hill, spent the night at a nearby hotel, and set off early the next morning to do it again. this time, they reached the summit and finished filming successfully - or so they thought.

Later, when editing the final version, they realized that the footage they had shot at the summit was unusable. With no time left in the budget, they were forced to charter a helicopter, fly herself and the camera crew to the summit so they could reshoot the scene. Naturally, there were a couple of hill-walkers already at the summit, so she went over to them, introduced herself, and explained what she was doing - only to receive the icy reply "Oh, so that's how you do it. Most of us just have to walk up."

She wrote that it was all she could do to refrain from grabbing them by their throats, one in each hand, and choking them while screaming "I CLIMBED THE BLOODY THING TWICE IN TWO DAYS, YOU MORONS" (or words to that effect - I quote from memory, and probably do not do it justice).

I've never seen Bear Grylls's show, but I believe some of the criticisms of it are well-founded. However, it may be worth remembering that even someone who is genuinely trying to make a show as realistically as possible may be forced to cheat a little in order to reshoot some scenes or come up with that little bit of extra footage.

I'm not saying this is what happened here, only that it might be.