The interior of The American Bookshop is the set of the River City Library from Warner Bros. The Music Man (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.
Screenplay written by Irving Fineman, who is also author of the controversial on-screen novel that sets plot in motion when Suzanne Pleshette's character refuses to apologize for allowing students to read the sizzling book.
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