I guess I don't understand, in the imaginary hoax, why it would be so important to put a rock in one place on the set instead of another. Maybe filming took place over several days, and the rock had to be sent away for cleaning, so it was important to put it back in the same spot.

I'm not a psychologist, and I don't even play one on TV. But the people I know who are psychologists (or who play them on TV) talk about confirmation bias, the tendency to accept evidence which supports one's prior beliefs, and ignore or reject evidence which doesn't. That seems to be what's mostly going on in these moan hoax arguments.