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During the final season, Malloy had a girlfriend named Judy, who was often talked about and appeared in a couple of episodes. She was played by Aneta Corsaut.
The dispatcher's voice was that of Shaaron Claridge, a real Los Angeles dispatcher. Jack Webb thought using a real dispatcher for the voice-overs would lend authenticity to the program.
In keeping with the reputation of Jack Webb's series being scrupulously accurate about police procedures, selected episodes of this series were used in police academies as instructional films.
In the final episode, Reed received the Medal of Valor for saving Malloy's life.
Martin Milner's daughter, Amy, made a guest appearance playing the daughter of a shopkeeper shot during a robbery. Look for her as Debbie McMahon in Victim of the Crime (1975).