I found it interesting that that they approached the sociological impacts on sci-fi, how what's happening in the world around us influences the subjects dealt with, for instance the subject of fear. The american culture is one built on fear. Fear of communists, fear of terrorists, fear of the government or little green men. Nowhere is this as prominent as in american sci-fi. This was sufficiently explored in this documentary.
I was absolutely horrified when I discovered that they had omitted Blade Runner. They obviously thought that it had no place in a documentary about science fiction movies. While we're at it, the WWII holocaust never happened.