The actors sing their own songs except for Drew Barrymore, who convinced Woody Allen that her singing was too awful even for the realistic singing voices he was after. She said she doesn't even sing in the shower.
The title of the film comes from a song in the Marx Brothers movie Horse Feathers (1932). One of the songs, "Hooray for Captain Spaulding" (which is sung in French), is from another Marx Brothers movie, Animal Crackers (1930). Another soundtrack song, "You Brought a New Kind of Love To Me," was sung by the Marx Brothers imitating Maurice Chevalier in Monkey Business (1931).
In the Harry Winston dance sequence, Edward Norton's dancing resembles that of Groucho Marx in Animal Crackers, the character celebrated later in this film, when they perform Hooray for Captain Spaulding in French.
In the foreign release of this film the producers wanted all the singing in English, and all the dialog dubbed. There is one scene where Goldie Hawn is speaking while Alan Alda is singing live on the set. This segment of singing had to be re-dubbed into English by Vocal Contortionist Jeff Bergman - Segment Produced by Roy Yokelson.
The narrator, D. J. (played by Natasha Lyonne), says that her real name Djuna (after the novelist Djuna Barnes, who wrote Nightwood). Barnes was later a very minor character in Allen's 2011 movie Midnight in Paris.
Referred to, in the title story of the short-story collection 'We Were Writers for Disastrous Love Affairs Magazine' by Adam Thomlison, as "that Woody Allen musical." It is to date Allen's only musical.