The interior of The American Bookshop is the set of the River City Library from Warner Bros. Le marchand de fanfares (1962).
Donahue and Pleshette were later married in real life, if for only nine months.
The book that Prudence is disciplined for giving to her student is "Lovers Must Learn" by Irving Fineman, the novel this film is based upon. This was also the title used during filming.
Al Hirt would rise to fame once again when his number "Java" was used as the gymnastics floor exercise music accompanying the 1972 gold medalist, Olga Korbut.