Features three guest stars, Randolph Mantooth, Tim Donnelly and Marco Lopez (the latter two uncredited), who would later appear regularly on Emergency! (1972), also produced by Jack Webb.
Dick Whittinghill, who was a Los Angeles radio personality, plays the man trapped in the phone booth; in the background you can see his restaurant, Whittinghill's, which was in Sherman Oaks.
Hilary Warner says she is seventeen. Linda Henning, who portrays Hilary, was twenty-six at the time.