Continuity mistake: Randall has strange pale eyes but just before he shoots Dwight, when he is aiming the gun at Tammi, there are several close ups of his face and his eyes are a normal brown.
Continuity mistake: In the opening scene, when the guy is calling from the booth, he is standing either on the left or right side of it, depending on the shot. (00:00:40)
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