Trivia: In the opening scenes Paul Reuben, driving a camp bus, is passed by a motorized "wheelchair." This was the world's first "Personal Mobility Vehicle", invented in 1959, named the "Ramble Seat." This prop has never been seen again, despite the family looking for decades.
Trivia: The domed city seen in a few shots is the same model city used in Logan's Run.
Trivia: Jim Henson's daughter, Heather, has a cameo as the girl serving drinks at the Bavarian Festival.