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The title character is based on the real life depression bad girl Ma Barker, later played by Shelley Winters herself in Roger Corman's Bloody Mama (1970)
Actress Julie Newmar, uncredited, makes a brief character appearance as the Catwoman during one of the outdoor jail scenes and where both the characters of the Penguin and the Joker were mentioned, however, were doing solitary confinement.
Milton Berle, who has an uncredited cameo, would later return in the final season to play the villain Louie the Lilac.
The numbers on Legs's prison uniform appear to be her measurements (35-23-34: accuracy indeterminate).
The bomb in the bat mobile was set to go off once it passed 60 mph, but the actual car due to weight and design had a maximum speed of 30 mph.
The title character is based on the real life depression bad girl Ma Barker, later played by Shelley Winters herself in Roger Corman's Bloody Mama (1970)