Sharp eyed viewers will not believe their eyes in this episode. Look closely at the blond haired girl in the front row of Robbie's classroom. Recognize her? I am positive that this is Ronne Troup (real-life daughter of actor Bobby Troup) who would play Chip's future wife in the eleventh season of the show in 1970. Her uncredited bit here as a classroom extra, gives credence to the fact that Ronne was indeed a few years older than Stanley Livingston (Chip). This episode was filmed in 1963, so Ronne would have to have been approximately 18 years old at the time. Curiously, Ronne's birthdate has never been made public and I always assumed she was born circa 1952. Ronne's older sister was Cynnie (a show business script supervisor) who was born in 1943, so it's only a guess on my part here, but Ronne may have been born in 1945 making her at least five years older than co-star Livingston? The actress' credits list her first 'professional performance' as 1966, yet this episode was three years before that!
Linda Foster, who will appear on the show several more times throughout the series in Guest Star roles, was born in Lancaster, England.
Robert N. Beach appears uncredited as Alan Wheeler.