Most of the "Teenage Diplomats" use their own names as the character names. The exceptions are the pivotal roles played by Kathy Dunn (Candy Hull the American), Lynne Sue Moon (Mai Ling the Chinese), and Gina Trikonis (Natasha the Russian).
The Teenage Diplomats were girls who won a publicized contest to have roles in the movie.
This was the only theatrical feature film for Kathy Dunn. The rest of her short career was made up of stage and television work.
William Castle: [gimmick] Audiences in the theater were given lickable lottery cards for a chance to win a prize.