Continuity mistake: While Mulder is picking himself up in the synagogue's attic after being pushed/tripped, you can see that his gun is unloaded, with no magazine. (00:25:07)
Continuity mistake: The wedding ring Ariel is holding in her outstretched hand is either vertically protruding from the palm of her hand or is hidden inside of it, depending on the shot. (00:40:25)
Answer: He was being facetious. He doesn't specifically know that information, he was merely giving examples of the types of information he has access to.
I think so too.
lionhead