Revealing mistake: When George gets out of the car, one can hear strong gusts of wind produced by the coming storm, but trees and bushes do not move at all. (00:00:50)
Revealing mistake: When the detective speaks with the undertaker, on the left side of the screen the place where the smoke is produced is visible. (00:21:35)
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