John Williams Burns, Jr. (Dan Aykroyd) has the same prison number, 7474505B, that his earlier characters Jake Blues and Louis Winthorpe III had in "The Blues Brothers (1980)" and "Trading Places (1983)" respectively.
The film ends with Wolfgang Amadeus Mozart's "The Marriage of Figaro" which is the same piece of music that opened Dan Aykroyd's earlier comedy "Trading Places (1983)."
Donna Dixon and Dan Aykroyd are married. They tied the knot after working together on Doctor Detroit (1983), and also appeared in Spies Like Us (1985), as did Chevy Chase, who cameos in this movie. Aykroyd and Dixon also appeared in Exit to Eden (1994) and the fourth segment of Twilight Zone: The Movie (1983).
The radio scenes were filmed at the studios of KFI AM 640, while "The Rush Limbaugh Show" was airing. KFI is the top talk-radio station in Los Angeles. The actors and actresses had to film off to the side so they wouldn't interfere with the operation of the radio station.
In his 1994 book "We're Ready For You, Mr. Grodin: Behind the Scenes at Talk Shows, Movies, and Elsewhere", Charles Grodin recalls that Walter Matthau had refused to speak with him ever since a misunderstanding occurred during post-production on their previous film together, Movers & Shakers (1985), at which time Matthau felt Grodin tried to take the movie away from him in the editing room. They finally reconciled when they worked together for one day on this movie.
Chevy Chase: As a father in a television commercial while Dan Aykroyd is in a limousine with Donna Dixon.