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.