I watched this last night with some trepidation - I was expecting him to waltz into the Amazon and immediately start taking superb photo's.
However, I was very pleasantly surprised - whilst he had an experienced local guide, he appeared to be left to pretty much his own devices, and struggled to take decent pictures, and acknowledged (repeatedly) that it was much, much harder to take a decent wildlife shot than he had anticipated. I was surprised that the pictures of the river dolphin came out as well as they did given the lack of light (overcast rainy ray, taken through very tannin-rich (looked like strong milk-less tea!) water. Maybe he did receive some off-camera advice on settings?