Musings of a Cigarette-Smoking Man - S4-E7
Other mistake: In the episode "Musings of a Cigarette Smoking Man," when CSM is writing his letter of resignation on his typewriter, you can see that the letters are already there - he is simply typing over them. (00:39:30)
Musings of a Cigarette-Smoking Man - S4-E7
Other mistake: When the CSM is aiming at the door, it must be quite difficult for him because it seems that he forgot to take off the protective lid from the night vision rifle sight. (00:35:10)
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