Just another little addition to this one (It's one of my pet subjects).
As well as the actual moonrock that has been brought back from a variety of locations on the moon (kinda hard to fake that) there's the eye witness accounts..
The Trans-llunar injection burn for the apollo missions was *brilliant* in it's intensity, and was witnessed by crowds of people on Mauna Kea, one of the observatories on hawaii..
Add to that the various Radio Amateurs (my old Physics Teacher was one of them) who listened in to the radio traffic coming from the Command Module during the missions.. that's *incredibly* hard to fake, if not completely impossible (even with 2003 technology)
The main thing about it is: all of the apollo hardware was built by real people, thousands of them working in hundreds of contractor companies across the US.. I'm a hardware designer (I build microcontroller circuits) and I'm absolutely certain that you could not have had that many creative engineers who would agree to spend years of their lives designing systems, only to happily go along with faking it.
And here's the thing: Nobody built a system to automatically fly and land the apollo modules, it was all flick switches and manually operated. It's *much* harder to have the whole thing happen automatically than it is to have a human learn how to operate the machines and do that.
All of the Apollo hardware stands up to scrutiny: it would work (and did work), exactly as designed.
Personally I'm hoping that during my lifetime I can buy a tourist trip to the Armstrong Aldrin Museum at Tranquility base, and see the original landing site... and we can once and for all bin this ridiculous conspiracy theory!