Catherine Deneuve's part was originally intended for Shirley MacLaine.
Jack Lemmon approached John Schlesinger about directing the film, but he declined.
Poupée Bocar's debut.
Los Angeles' famed Greystone Mansion is used for the interiors of the Greenlaw mansion, including the small bowling alley, which is upstairs in the wing that runs beside the mansions drive-through, as well as the card game room where Andre is first seen fencing.
Lemmon will play the same put-upon businessman dealing with big companies and big cities the next year in "The Out of Towners". Both characters could be said to have evolved from Felix Unger in "The Odd Couple" the year before, and all of them possibly descended from his Bud Baxter in "The Apartment".