The documentary was funny but also interesting to learn and remind about the methods that documentaries use to make audience believe what they are saying. It uses many similar methods that can be seen in modern documentaries too: scientist verification, undermining the opposing sides research data, being against status quo and introducing relatable humble normal person trying to prove the view (and suffering doing that).
It was fun to notice that although I knew it was wrong, some part of me wanted to believe it :).