Continuity mistake: Agent Frank Burst screams "Stop!", but in the previous shot the police car was already stopped, although deputy Scott Kerber has just pushed the accelerator. (00:03:30)
Character mistake: Pusher says that he read in Scully's files that she had shot Mulder, although after Pusher's visit in the Computer Records Office Skinner says that Pusher checked only Mulder's files. (00:40:15)
Other mistake: The FBI crest outside the main FBI building is incorrect as it has the words UNITED STATES BUREAU OF INVESTIGATION on it instead of FEDERAL BUREAU OF INVESTIGATION.
Continuity mistake: Pusher loads the revolver with one bullet, leaving five chambers empty. When Mulder picks it up and points it at Pusher, the bullet can be seen in the cylinder, just to the right of the gun barrel. Later, when Mulder begins to slowly pull the trigger for the third time (aiming at Scully), we see the cylinder turn to Mulder's left. Problem is, with the bullet situated as it was when Mulder picked it up, the bullet would have moved to the barrel and been fired the first time he pulled the trigger, killing Pusher. Instead, it fires on the third pull.
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