He could have easily edited out any mistakes that he made while in the bush and re-shot, but Les keeps them in to show that mistakes can be made no matter what the situation. For instance the laying his shirt on the bank mistake, being a Northern woods guy it would probably be just a natural thing for him to leave his shirt out like that with no problem, but he made the point by leaving it in the program so someone watching it hopefully won't make the same mistake. I have a lot more respect for Les being a "real life" survival person instead of scaling waterfalls and climbing into the rain forest canopy, things that would probably get you and I killed, like another survival show host does.