Improbable - S9-E13
Revealing mistake: When Scully is examining the body of Vicky Louise Burdick, the dead woman moves her eyeballs. (00:22:50)
Other mistake: While Cadet Hayes is being interrogated, he says, "I studied the photos of your son's death. They called to me. I don't know why, but it was a message and I listened." Then Scully answers, "And then you killed Agent Doggett's son." This answer is illogical and complete nonsense because the photos of Agent Doggett's son were taken after his death. (00:36:05)
Other mistake: When Doggett starts clawing at the freshly plastered wall, he does so at just below his eye-level and blood starts pouring from the hole he makes. The dead woman inside the wall was stabbed in the lower abdomen; there's no way that blood from the abdominal wound would've seeped through the wall at the level he was digging.
Continuity mistake: Marita Covarrubias tells the tribunal that she used to be Special Representative to the Secretary General of the United Nations. However, in "Herrenvolk," she told Mulder that she was the assistant to the S.R.S.G. (00:39:15)
Continuity mistake: The pencil on Dr Sanjay's folder is in a different position when the footage is taken from behind him. (00:02:24)
Continuity mistake: Soon after Dr. Sanjay falls, the blood flows down his cheek. However, when Mulder examines the scene, Dr. Sanjay's cheek is clean and the blood spot is on his forehead. (00:03:37 - 00:04:10)
Continuity mistake: Both the X-ray image and Mulder's statement suggest that the letter opener has penetrated Dr. Sanjay's head at an acute angle. However, during the autopsy, Scully removes the object as if it had been shoved horizontally. The latter position is confirmed by the suicide scene itself at the start of the episode. (00:08:25 - 00:10:10)
Continuity mistake: As Lindquist holds the bag of evidence, it is hanging down in the fingers of his right hand. The next shot shows him holding the evidence bag in the palm of his right hand.
Continuity mistake: The remote control, close to the TV, changes position in between shots near the start. (00:05:03 - 00:05:29)
The Lost Art of Forehead Sweat - S11-E4
Continuity mistake: When the camera shows Reggie Something from behind, he is shaking his head. However, after the cut, his head is static. (00:17:20)
Factual error: The package Scully receives lists her city, state, and zip code as Bethesda, Maryland 20880. While that is an actual zip code in Maryland, it is for Washington Grove, not Bethesda.
Visible crew/equipment: At The Beginning of the police car chase, the officer escorting Scully gets into a cruiser. The camera is reflected in the driver side window when he opens the door.
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