Other mistake: Deep Throat says that Mulder and Scully are standing in the very room, where "the first human-alien hybrid was created." However, only in the "Patient X" episode, are we told that it is Cassandra who has just become the first successful human-alien hybrid. (00:28:00)
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.
Continuity mistake: When Dr Cabrera says "Let him go," the blonde female assistant is on the left of the male assistant, but in the next shot she is on his right. (00:39:30)
Continuity mistake: When doctors make a cut on Cassandra's belly, the green substance comes out of the cut and pours down directly onto the piece of blue cloth she is covered with. In the next shot the fragment of cloth that was in contact with the substance is dry, but in the following shot, there is a large soaked stain on the piece of cloth. (00:00:50)
Continuity mistake: When the CSM discovers the bright spot on the carpet, he immediately realises that Mulder's apartment was under surveillance. However, one can notice that soon after entering Mulder's apartment, the CSM looks down at the floor and carpet covered with blood and there is no bright spot. (00:14:00)
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.
Continuity mistake: The truck stolen by Mulder from the Russian labor camp is Unimog 406. However, during the accident scene, when it comes out of the woods and falls from the hill, it miraculously turns into Unimog 404 model. (00:13:30)
Continuity mistake: During the meeting at a horse track, after the CSM says "You need my expertise, " the First Elder raises his head. In the following shot from the other side, he raises it again. (00:21:00)
Continuity mistake: When Mulder and Scully talk about the piece of skin while driving to the reservation, one can see that there are green trees from the Mulder's side of the road, but when the shot is taken from the outside of the car, there are only grey bushes and landscape devoid of nearby trees on both sides of the road. (00:07:00)
Continuity mistake: When we see Dana Scully after being abducted she has an instrument in the middle of her stomach, inflating it. When we see it in the first shot there is nothing but the instrument, then in the next shot there are gauze pads taped down all around it.
Continuity mistake: When Mulder tells Krycek to go to the bathroom and clean off, in the front shot Krycek holds his right hand raised, while in the back shot his right hand is lowered. (00:42:10)
Invocation - S8-E5
Continuity mistake: When Scully finishes her conversation with Doggett and walks away, there is only one dark-haired policeman watching the crime scene, but when Doggett looks at the crime scene and Mr. Underwood gets up, there is a blond-haired policeman talking with someone. (00:41:55)
Via Negativa - S8-E7
Continuity mistake: When Doggett and Skinner visit Dr. Andre Bormanis at his place, in the first shot from the back he is leaning over some laboratory gear that is holding in his hands, while in the next front shot he is standing upright manipulating on the table with his hands. (00:18:10)
Via Negativa - S8-E7
Continuity mistake: When Doggett leaves his office, he reaches for his coat, grabs it and starts to put it on. In the next shot, when Langly, Frohike, and Byers look in Doggett's direction, we again see that he takes the coat off from the chair. (00:27:55)
Within (1) - S8-E1
Visible crew/equipment: When Scully is looking at her reflection in the mirror, the camera moves toward her and its shadow appears on the left side of the mirror's frame. (00:02:00)
Trust No 1 - S9-E6
Continuity mistake: When the guy from the NSA is speaking with his supervisor, after the supervisor asks him about his wife and child, in the background he turns his head toward the supervisor, while in the next close-up take he turns his head toward the supervisor again. (00:12:30)
Trust No 1 - S9-E6
Continuity mistake: When Scully is pulling out, in close-ups she holds her cellphone in her left hand, while in distant shots she keeps her left hand on the steering wheel. (00:23:00)
Continuity mistake: When Knowle Rohrer is talking with Agent Doggett face to face in a separate room about the super-soldier project, he is wearing a red FBI badge, but in the previous scene when he came to visit Doggett, he was wearing a regular FBI badge. (00:08:40)
Continuity mistake: When Agent Reyes and Agent Scully are talking about mood music, in some shots Reyes rests her hand on the bed's backrest, while in other shots she firmly grabs it. (00:14:45)
Continuity mistake: When Agent Reyes is aiming at the oncoming car of a ranger, in the front shot the windscreen of the car is completely covered with dirt and fully opaque, while filmed from the ranger's side the windscreen seems to be transparent and relatively clean. (00:17:00)
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