This TV show brought up some interesting ideas, but some of them were fairly easily debunked IIRC. This was from at least 4+ years ago, I was still living in the States when it aired.
What makes you believe the conspiracy theory?
When I was at University (many years ago...

), a professor of mine was convinced it was just a diarama, not real. This was the same semester I had a different professor who insisted that aliens came down and mated with the ancient Egyptians and that's why their heads were elongated.