(assuming for a moment that the round earth is in fact not a conspiracy)
We could never have landed on the moon. The Van Allen radiation belt would have killed the crew. Its gamma radiation too (I believe) so the space suits (or the ship) would have to have been made either out of 2 or more inches of lead, or about 12 foot of concrete. Ether way you look at it, they could not have survived 10 mins going through that belt. Even now we dont have the technology.
And tell me this - how come the Appolo missions are the ONLY maned missions to have EVER gone through the Van Allen? Its because you cant, and the Appolo missions were fake. And if we could go to the moon all those years ago, how come we havent been to Mars yet? If the moon landings were real, then it is only a case of 3 months travel to get to Mars. The reason is again because of the Van Allen belt.
The problem of Van Allen isnt exactly insurmountable tho. Its a doughnut shape, so with some extra fuel you could actually (theoretically) go up and over it. This however poses a problem with efficiency (lowest energy flights are another story tho) and so thats why that hasnt been attempted yet.
So, in short, moon landings = blatant fakes, and they werent even covered up well imo.