I didn't see this particular show, but I have seen many other survival shows including some of the other Bear Grylls shows...
I have to say that to me, he comes across as a complete prat! He has no real idea about survival and clearly hasn't received any extensive training and if he has, he is too foolish to apply it. Every show that I have seen of his, he has almost killed himself by not even following the basics, like boiling water from a stream before drinking it. Ray Mears on the other hand is far more knowledgeable, confident and also more respectful of the land.
But at the end of the day, what these shows are trying to do is show modern day people the basics on survival, as they have forgotten how to survive!
Do you think in the middle of the rainforest there is a local Tesco or Asda?