Continuity mistake: During the autopsy, Scully says that the date is August 29. The two previous episodes were set in September. (00:09:50)
Continuity mistake: Ellen stays by the door looking to the right from it, but in the next shot she looks straight at Mr Incanto. (00:33:55)
Continuity mistake: The drawing image of the killer loads twice on the computer. You can see it start to load in the first shot which is closer. In the very next shot it loads from nothing again.
Continuity mistake: When the prostitute, Holly MacClaine, is first murdered, we see her face up. The next morning, when the police are at the crime scene, we see her face down.
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