The last twenty minutes talks about Jim Garrison and Clay Shaw, as covered in Oliver Stone's film, and even covers the rumors that homosexuality had something to do with the plot (as in the film). It's pretty silly stuff now, post Stonewall. I remember comments in newspapers that Jack Ruby always took the "female position" (bottom) in sex. Yes, the papers really said that in 1964.
Update: June 13, 2014
CNN re-aired this documentary on June 12 (both hours) and will do so several times in the near future. This time, the impression seems to be that such an insignificant failure of a man could change world history, just one hour after the Cuban Missile Crisis. .