For a start it is one of those documentaries that you get on Nat Geo and Discovery that are clearly written for someone with the attention span of a goldfish with Alzheimer's, repeating the same things over and over again every two minutes.
But then it is also one of those documentaries that try to present some sort of science, or purport to do so at the very least.
They did a load of stuff on analysis of the classic big foot film footage by Patterson–Gimlin. All sorts of computer simulation and animation, motion capture of an actor trying to do the same gait, etc. All supposedly impressive stuff with no real conclusion.
But then they throw in something about hair samples. Apparently big foot hair samples have been collected but inconclusive in DN
But wait, what? They placed a trap and got what they think is big foot hair?!?!!
So, (a), what happened to the dozens cameras that they must surely have placed around the trap at the time? Surely? They did not place it with no cameras? That would be madness.
But, (b) assuming some brain numbing insanity meant they did not place cameras, they have none the less discovered a way to attract a big foot. So what the hell, do it again, and this time place cameras. Do it 50 times and place cameras at every site. If this was really big foot they attracted then they would get so much media coverage from actually catching one, even if only on good quality film, let alone in real life, surely they have to make use of this trick for luring a big foot? But no, they gloss over the fact that the hairs must be big foot, but that is that...
I mean, the whole thing had bugger all credibility as a documentary in the first place, but it really does fall apart if you try watching it. It was a mistake to watch it, sorry.