Two of the young stars appearing in this episode, Kevin Coughlin and Jill Banner, would both die in traffic accidents while in their thirties.
Guest star Viginia Gregg appeared on the series the week before on the episode "Personnel: The Shooting", in a different role. Ms. Gregg appeared in a total of 13 episodes of Jack Webb's Dragnet (1967) series.
The book that was vandalized was The Legend of Saint Julian the Hospitaller by Gustave Flaubert.
Caliber, refers to the diameter of the bore .