Ralph Bellamy and Ameche "cheerfully admitted" they were unfamiliar with Eddie Murphy and Dan Aykroyd's work prior to working on the film. The two also said that Murphy and Aykroyd acknowledged that they were unfamiliar with Bellamy and Ameche. While this was Bellamy's ninety-ninth film, and Ameche's forty-ninth, this was only Murphy's second film, and he joked: "Between the three of us, we've made one hundred fifty movies!"
The scene where Mortimer Duke (Ameche) is trying to catch the money clip, and having trouble, wasn't supposed to happen that way, but both kept going with it, and not breaking character, so it was kept in the movie.
This was Ameche's first film since "Suppose They Gave a War and Nobody Came" (1970). He had been doing television guest appearances. Ameche had no agent listed with the Screen Actors Guild, but he was in the phone book, so director John Landis simply called him and asked if he'd play the part. This movie jump started his return to theatrical films, including an Academy Award for Best Supporting Actor for "Cocoon" (1985)...
