Memories....
I made the mistake of seeing this when it was released in the 70's. The one thing that stands out in my memory (besides Stella's bikini) is that damnable robot. Virtually every audience member rejoiced at his destruction and then moaned in pain when he was revived.
"Ya can't keep a good robot down"
The entire audience: "Oooh noooo...."
Many UFO/ghost skeptics are actually afraid it's all true and don't want it to be.