The plane Paul Cook lands in is a Cessna 320D, registration: N4178T. It was involved in the fatal crash in 2003 in Mazama, WA.
Guest star Kevin McCarthy was also in two classic alien invader films: Invasion of the Body Snatchers (1956) and the remake Invasion of the Body Snatchers (1978).
John Zaremba, best known for his role on The Time Tunnel (1966), plays a bit part as a general near the end of the episode.
Kevin McCarthy is replaced by an alien in this episode. In the classic movie Invasion of the Body Snatchers, he played one of the few humans in the town who was *not* replaced by an alien.