This movie was going to be called "Erasmus With Freckles," after the book on which it was based. But Brigitte Bardot only agreed to appear on the condition that her name did not appear in the credits or any of the promotional materials. The only way the producers could capitalize on Americans' fascination with Bardot was by changing the title to alert the audience that she was in the movie.
The large, room-sized computer seen in this film appeared repeatedly in 20th Century-Fox productions of the era, and had previously been featured in Une femme de tête (1957) and La Mouche noire (1958), among others.
The film featured an old river boat turned houseboat. The location of the houseboat was in Richardson Bay, between Mill Valley and Sausalito at Marin City.
Glynis Johns character, Vina Leaf, firmly and politely defends England's bankers when the Bank Manager attempts to contrast the way English and American banks regard children. Glynis Johns previous theatrical role was the mother of two small children and wife of an English banker in Mary Poppins (1964).