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.
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!"
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."
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).