About eight minutes into the film, Jerry Lewis (as the chauffeur) sits down to listen to a phonograph record. It's his son's band's (Gary Lewis & The Playboys) biggest hit, "This Diamond Ring."
Uncle Julius, the photographer, was based on Jerry Lewis' role of Professor Kelp in "The Nutty Professor." Same voice, same glasses, same mannerisms.
Capt. Peyton's aircraft, N8047 is a 1929 Ford 4-AT-E Tri-Motor (sometimes called the "Tin Goose"). As of March 2022, this aircraft is still registered and is owned by Eastern Air Transport-EAA Aviation Foundation (Museum), Oshkosh, WI. Of the 199 Tri-Motors produced, only 18 are still in existence, with 8 having valid airworthiness registrations. The Tri-Motor was built to be economical and was constructed out of corrugated aluminum alloy, giving it the unique appearance you see here.
The four-engine Continental jet seen taxiing out is a Boeing 707-321C, an "Intercontinental Golden Jet." It was serial number 18826, and was deregistered from the FAA on 7/28/1972, and exported to Canada.
Skylock Peyton is the only uncle who's face is revealed before he speaks.