Screenwriter John Hughes is credited as "Edmond Dantes." The pseudonym is a homage to a character in "The Count of Monte Cristo."
Brian Levant took over as director just after the start of filming, replacing Steve Rash.
Eleanor Keaton, Buster Keaton`s widow, trained the dog Beethoven for this movie.
So incensed were the American Veterinary Association about the depiction of a vet as leader of a dog-napping ring, they fired off a letter of protest to Jack Valenti, head of the Motion Picture Association of America.