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.
In the Harry Winston dance sequence, Edward Norton's dancing resembles that of Groucho Marx in Animal Crackers (1930), 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, with the segment produced by Roy B. Yokelson.
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.