Caesar Giovannini, who wrote and played the piano solos, was once the music director for the "Kukla, Fran, and Ollie" show.
The actress playing the girl being criticized by her mean piano teacher is Monika Henreid, daughter of the director Paul Henreid.
Vladimir Sokoloff, not introduced as a featured player during the Karloff intro, has closing credits in a larger typeface than those of Reggie Nalder, who was introduced as a featured player.