In the briefing message, this is the first time Control has said "your mission, should you agree to undertake it" instead of the standard "your mission, should you decide to accept it."
The aircraft shown taxiing at the beginning is a VIP DC-8 belonging to the French Air Force.
The station call letters "KBEX" are commonly used in movies and TV, almost being as generic as the "555" phone prefix. KBEX is actually an FM radio station at 96.1 in Dalhart, Texas.
Lynda Day George, Casey, was pregnant at the time the episode was filmed, and was not present in several other season seven episodes.
Gary Lockwood who plays the antagonist in this episode, is most well-known as the lead actor in 2001: A Space Odyssey (1968), as Dr. Frank Poole.The film centers on an investigation of an alien transmission to the Jupiter moons, and the onboard spaceship rogue Artificial Intelligence, which tries to wipe out the vessel's personnel because they are deemed irrelevant.