Continuity mistake: When Mulder is talking to Dana's mom about finding her cross (necklace) in the trunk, Scully's mom says that she gave it to her on her 15th birthday, but in Season 5 in Christmas Carol, Scully has a flashback to receiving it at Christmas. (00:41:40 - 00:43:55)
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: The Father is standing in some darkened part of the room, however in the next shot the room is all lit up and there is no darkened place there. (00:38:25)
One Breath - S2-E8
Continuity mistake: When Mulder is running through the corridor, in the front shot the rack is missing and the person on the wheelchair suddenly appears, compared to the back shot. (00:14:00)
Red Museum - S2-E10
Continuity mistake: While talking, Mulder, Scully and the old farmer are leaning against the bar which is absent in the distant shot. (00:23:00)
Red Museum - S2-E10
Continuity mistake: When the old man shows Mulder the two guys, the one that is not Deep Throat's murderer, from a distant angle his shirt is completely red. In the close-up he has a red and a bit green shirt.
Red Museum - S2-E10
Continuity mistake: Scully is walking down the steps as Mulder and the sheriff are talking about the boy. In the wide shot she is halfway down. In the closeup she comes up from behind Mulder.
Continuity mistake: When the nurse takes off the bedding, the sheet is crumpled, but in the next shot it is suddenly pretty straightened and smooth. (00:02:50)
Continuity mistake: In "Firewalker," Mulder reports that the day is November 11 and that he and Scully ended up in a 30-day quarantine. Scully reports that the date for the autopsy in "Irresistible" is November 14, which conflicts with the quarantine. (00:20:40)
Continuity mistake: Scully pushes Pfaster into the bathtub and he gets out soaking wet however when he leaves the bathroom and begins to chase Scully around the house his clothes are bone dry. (00:41:20)
Die Hand die Verletzt - S2-E14
Continuity mistake: Having finished his conversation with Scully by the tree stump, Mulder walks away. However, in the next shot he again starts to walk away from Scully and from closer than before. (00:07:30)
Fresh Bones - S2-E15
Continuity mistake: In one shot near the start the private is turning the steering wheel while in the previous and next shot he holds the wheel fast with his arms outstretched. (00:02:30)
Colony (1) - S2-E16
Continuity mistake: When the doctor leaves the common room, he is holding a chart in his left hand, but when he is running down the corridor, both his hands are free. (00:04:40)
Continuity mistake: When Mulder pulls the nail from Blockhead's nose, the pliers are at The End of the nail, but in later shots it changes to the middle and then back to The End.
Continuity mistake: When the dad is offering the son some ice cream, the cone he offers is a single scoop. In the next shot, as the son takes it, it is now a double scoop. In addition, the scoops change from single to double and back and forth in the next few shots.
Continuity mistake: When Scully starts the procedure of taking out the bug from the body, she is wearing no mask, but when she finishes it she is wearing the mask. (00:21:45)
Soft Light - S2-E23
Continuity mistake: When the guy looks through the peephole, Dr Banton casts no shadow, while in other scenes he does. (00:01:55)
Soft Light - S2-E23
Continuity mistake: After the meeting with Dr. Davey, we cut to Mulder sitting in the train station trying to figure out what Dr. Banton was doing in the video. We see an overhead shot of the station, which shows a column in the far distance. Watch carefully: the shot never loses sight of the column, and you can see random passersby walk towards the column, but NO Scully. As the camera moves downwards to focus on Mulder in the foreground, Scully suddenly appears from behind the column, as if she had been walking towards it all this while. Obviously, she had been standing behind the column until her cue to come out. (00:19:45)
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