They tried to fake a moon landing, but they had trouble with the effects, so they packed up the movie studio, strapped on a Saturn rocket, and filmed the fake landing on the moon to save the effort of making complicated special effects.
Oh, and the pentagon? Obviously an alien attack. A UFO flown by Elvis and the crew of the Mary Celeste launched an invisible cruise missile at the Pentagon before going through a wormhole and then killing JFK. Oh, and the holocaust never happened. The aliens at Area 51 told me.