The Sixth Extinction (2) - S7-E1
Factual error: When Mulder is visited by his mother, he definitely shows brain activity, because he is "talking" with her, however there are only flat lines on the monitor. In a similar situation in "The Sixth Extinction" episode, when Kritschgau and Skinner ask him questions and he anticipates them, the monitor shows intensive bursts. (00:01:15)
Millennium - S7-E4
Continuity mistake: When Skinner walks away from the conference table, his armchair is only slightly turned left from its normal position towards the table, but when he comes back with additional documents, the armchair is turned left to the position perpendicular to the table. (00:10:20)
Millennium - S7-E4
Continuity mistake: When Scully stops by the fence that leads to the necromancer's property, there is only one red car parked that seems to be Frank Black's car. It seems that Mulder's car and the necromancer's car vanished into thin air. (00:38:40)
The Sixth Extinction (2) - S7-E1
Continuity mistake: From The Beginning of the episode Scully has loose strands of hair on both sides of her head, but when she turns off the lamp and is attacked by locusts, her hair is perfectly combed. (00:02:35)
The Goldberg Variation - S7-E6
Revealing mistake: Henry's right eye is glass, yet its pupil dilates and constricts respective to the amount of light to which it's exposed.
Plot hole: The subject of the stakeout - the religious man dressed as a female prostitute to 'put the other prostitutes at ease' before trying to 'save' them - is shown when Scully is on the phone telling Mulder about it; the man has a very masculine face, a hairy stomach and is in no way convincing. It's extremely unlikely that such an obvious cross-dressed male would fool such a large amount of people.
Continuity mistake: After Rob returns to his apartment after throwing out the trash bag with the bloody shirt inside, his mouth starts bleeding and he goes to the bathroom. He removes his false teeth and a few of his real teeth start falling out; he has a small smear of blood on his bottom lip when the camera is looking at him but his mouth is clean when the shot changes to his reflection in the mirror, with no time in between for him to wipe it.
The Sixth Extinction (2) - S7-E1
Factual error: When Skinner is at Kritschgau's apartment building, the time stamp onscreen says it's 5:05 AM, but when Kritschgau answers his door, he says it's 6:00 in the morning. Plus it is shown to be broad daylight outside. The sun is never up that early in Washington, D.C. (00:15:55)
The Sixth Extinction (2) - S7-E1
Character mistake: When Scully is reviewing part of the translation she has made of the alien artifact, there are four amino acids that she has written: Ademine, cytosine, thymine and guanine. Ademine is misspelled. It should be adenine. (00:23:10)
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