How about all the satellite images showing the flag still where it was planted on the moon back in 1969. The logistics of pulling off a fake moon landing and then keeping it secret is just too much. Too many people were involved.
Or maybe “too many people” weren’t involved. Unless you’re the CEO of a company, would you really know what projects the other departments in your company are working on? Unlikely. And if the moon landing was faked (it was)then there wouldn’t need to be a particularly large group involved anyway.