Glom - that's a good point.
It is theoretically conceivable that a government might create fake photographs of a Moon landing, because they're the only ones there. But as you say, the conspiracists have taken the arguments from there (and, I suppose, the Kennedy assassination), and started to apply the obsessive search for "anomalies" to every single occurrence, even when there are hundreds of sources for the pictures. And when they find those anomalies, they proclaim that "everything's a fake!" rather than "hmm, anomalous things show up in photos all the time, so I guess they don't mean that a photo is fake."