Character mistake: Scully continually addresses the senior police officer as "Captain." But he wears sergeant's stripes. As a law enforcement officer continually dealing with other law enforcement officers, Scully is not likely to make this mistake. More likely a failure to match script with costume.
Continuity mistake: When the car drives down the hill, the front and rear left window of the car is open, but in the shot from the inside of the car after it is stopped, there is Crump's blood on the closed rear left window. (00:40:05)
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