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: When Agent Scully is leaving her apartment to meet Agent Doggett and Agent Reyes, her mother is holding William in her hands. Depending on the shot, William's head is turned right or left. (00:21:30)
Continuity mistake: Agent Doggett holds the rubbings in his hands and after a while, he hands them over to Agent Reyes. However, when filmed from behind Doggett, the rubbings are in the same position in both situations. (00:07:45)
Continuity mistake: When Agent Doggett follows Lukesh into the parallel universe trying to find him, Lukesh suddenly reappears from Doggett's left and is pointing at him with the gun held in the left hand, while in the next shot he is aiming at the agent from his right holding the gun in his right hand. (00:03:25)
Continuity mistake: When Natalie stops kissing Dylan, her lips are covered with blood, but the moment she leaves Dylan's room she has no sign of blood on her lips. (00:32:00)
Nothing Important Happened Today (1) - S9-E1
Continuity mistake: When Agent Reyes and Assistant Director Brad Follmer meet in the bar, Brad is holding his glass either by the cup or the stem, depending on the shot. (00:18:20)
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)
Nothing Important Happened Today II (2) - S9-E2
Continuity mistake: After entering the room with the water tank Agent Doggett has dived into, the Assistant Director Brad Follmer screams "Doggett!", while in the same scene in the "Nothing Important Happened Today I" episode he screams "Agent Doggett!" (00:03:35)
Trust No 1 - S9-E6
Continuity mistake: When Scully reads the alleged printout of the email sent to her by Mulder, it says: "Dearest Dana: I've resisted contacting you for reasons I know you appreciate...I want to come home, to you, to William", but when Scully has previously viewed this message in the internet café, it had a different form: "I've resisted contacting you for reasons I know you continue to appreciate...I want to come home. To you, and to William." (00:06:05)
Nothing Important Happened Today (1) - S9-E1
Continuity mistake: During the previous episode, Skinner receives a nasty gash on his head courtesy of Billy Miles. This episode takes place 48 hours later and there is no indication whatsoever that Skinner received such an injury (the wound is visible once again in the next episode). (00:15:35)
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