The scenes in med-lab feature a mock-up of Bill Mumy. His father had recently died and he did not feel that he could cope with doing the scenes as it reminded him too much of the loss of his father.
Andreas Katsulas was not aware that a mock-up of Lennier was being used in the Med-Lab scenes. He later congratulated Bill Mumy on how still he managed to be during those scenes.
Lennier claims to be suffering from "Netter's Syndrome" to get away from the Obnoxious man. Netter's syndrome is a reference to executive producer Douglas Netter.
This takes place from January 13 to January 14, 2260.
John C. Flinn III: the series' main cinematographer and occasional director, gives a cameo performance as The Obnoxious Man.