Trivia: While Steve Martin and Nina are discussing the Wedding Coordinator, Martin says they will end up broke and walking the sidewalks in a bathrobe. Martin did exactly that in 1979's The Jerk.
Trivia: Martin Short was not supposed to have the accent he uses in the film. Instead, as a joke he began using it and the director thought it was funny-so it stayed.
Answer: "Volare", originally performed by Nicola Arigliano in the 50's, but made most popular by Dean Martin.