The black & white photos that David Vincent is looking through in Lloyd Lindstrom's NY apartment are all images from the previous episode "Beachhead."
The sound effect for the brain washing machine that the Invaders use on Lloyd Lindstrom and David Vincent is the same low pulsating sound effect used in The War of the Worlds (1953) .
Dabbs Greer would also play a minister in Little House on the Prairie.
French title: "L'expérience".