The movie's opening title song was sung by co-lead star Annette Funicello with back-up vocals from The Beach Boys.
Tommy Kirk was asked by Disney to reprise his role in this film after Walt Disney had terminated his contract prior to the film.
Judy the Chimpanzee used to sit in Walt Disney's lap all the time. After waiting in line with everybody else to get her coffee and doughnut just before work, then get her sugar, Judy would go over to Disney's director chair sit in his lap, and never get a crumb on him and never spill a drop.
Judy the Chimpanzee was on the stage playing the tambourine with the The Beach Boys in the opening scene.
The film may have been amusingly prescient in its depiction of human powered flight. In 1977, a dozen years after the film's release, the Gossamer Condor won the Kremer prize for sustained, controlled human powered flight with a lightweight pedal powered plane, not unlike the one used by Merlin Jones.