Continuity mistake: Mulder recalls to Scully that he saw Krycek being pulled out of the car and then saw the bright flash, but he only came to just in time to see the flash. (00:08:50 - 00:12:00)
Visible crew/equipment: At the silo in North Dakota, the camera pans around the vehicle after Mulder and Scully arrive. The boom mic is reflected in the passenger doors.
Factual error: At The Beginning of the "Musings of a Cigarette-Smoking Man" episode Frohike says that the CSM appears when Trotsky was assassinated, i.e. 20 August 1940, but he does not claim that this is an exact date of birth. However, he further says that during the Nazi-Soviet Pact (1939-41) the CSM's father "kept NKVD informed on American plans to enter World War II" and for this reason he was executed before the CSM learned to walk. This means that his father could not have been executed earlier than in 1941. Assuming that babies learn to walk between a few months and 2 years, the CSM could not have been born earlier than in 1939. It means that in 1953 he should have been a young teenager, and not an adult man, as he is presented. (00:03:45)
Continuity mistake: After the crash Mulder rests his head on the passenger dashboard, however in the previous shot filmed from the outside he keeps it on the headrest. (00:08:30)
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