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)
Anasazi (1) - S2-E25
Continuity mistake: When the military man approaches the Cancer Man we can see at the background the helicopter's left-hand side. When they move towards the helicopter, now closer to them, we see its right-hand side. (00:40:14)
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