All the characters are named after conventionally beautiful film stars of the day: Lana for Lana Turner, Marilyn for Marilyn Monroe, Grace for Grace Kelly, Rex for Rex Harrison, Eva for Eva Marie Saint, Valerie for Valerie Allen.
Three separate characters - Uncle Rick, Dr. Rex, and Dr. Sigmund Friend - were identical in appearance, but were distinctly different as portrayed by Richard Long. Uncle Rick was kindly and down-to-earth; Dr. Rex was eerily good-natured, with some peculiar mannerisms; and "Sigmund Friend" was a Freud-like, ominous and shadowy character with a thick German accent.
This episode is reported to be the inspiration for "Uglies", a 21st Century series of young adult science fiction novels by Scott Westerfeld.
This episode is based on Charles Beaumont's short story, "The Beautiful People", which first appeared in the September 1952 issue of the science fiction magazine "If".
This episode takes place in 2000.