1.Agent Mulder’s cell phone number in the series is 555-0199. The same number is used by the Burnhas in “ American Beauty”, and Al Pacino leaves this number in “the Insider”.
2. In “Gender Bender” episode agent Mulder examines a dead body and you can see that the corpse is blinking.
3. In some episodes, Mulder’s gun has no cartridge clip.
4. In the pilot episode the man who substitutes Scully on the plane is David Duchovny’s father.