Continuity mistake: In "Firewalker," Mulder reports that the day is November 11 and that he and Scully ended up in a 30-day quarantine. Scully reports that the date for the autopsy in "Irresistible" is November 14, which conflicts with the quarantine. (00:20:40)
Visible crew/equipment: As Scully rolls down the stairs with the killer at The End of the episode, once they reach the bottom a hand pops out from the left side of the screen.
Continuity mistake: Scully pushes Pfaster into the bathtub and he gets out soaking wet however when he leaves the bathroom and begins to chase Scully around the house his clothes are bone dry. (00:41:20)
Revealing mistake: When Mulder, Scully and the other agent are looking at the covered body of the dead prostitute if you look closely you can see her chest rising and falling. (00:17:22)
Revealing mistake: During the opening funeral scene if you look closely you can see the dead girl breathe. (00:02:28)
Visible crew/equipment: Near The Beginning, Mulder, Scully, and another man are walking through a graveyard. The camera is following them to the right passing head stones. The crew can be seen reflected in a black shiny head stone as the camera passes.
Answer: As he stated many times throughout the series, Mulder needed Scully to be sober and skeptical. Whenever Scully's skepticism wavered and she started questioning her own rationality, Mulder would try to restore her sense of skepticism, because he needed her to be clear-thinking.
Charles Austin Miller