June Foray voices the femme fatale character here in the same exaggerated accent that Natasha, of Ricky and Bullwinkle fame, has. She also voiced that character.
The mechanical homing pigeon was an early version of what would be one the drone.
The Du Barry diamond was named for the celebrated mistress of King Louis XV Madame du Barry. She met her fate during the French Revolution, at the guillotine.