The x-ray image of the contents of the case were re-used as a prop in "Thingumajig"; supposedly being an x-ray of the Thingumajig.
The Cunningham family crypt set was reused twice in this series. It was Mothers hideout in "Who Was That Man I Saw You With" and Junipers workshop (painted white) in "Pandora".
Linda Throson said that during the shooting of the episode, it was nearly always raining, and the scenes with the German Shepherd smelt the wet dog.
Unlike all the other episodes, the usual final sequence in Steed or Tara's apartment was shot without either of them.
One of the few episodes, if not the only one, of the series, where you have a child character.