MAX, the ship's computer, speaks Bulgarian. When David enters the ship and takes the pilot seat, MAX says "Attention! Crois moi! Assiez Toi! Vnimanie! Oblegni se! Chui me!" which means "Attention! Believe me! Sit down!" in French then "Attention! Sit back! Listen to me!" in Bulgarian.
Originally an independent film. The main production company, Producers Sales Organisation (PSO), collapsed midway through production. Walt Disney picked up all rights for this film and several others in a liquidation sale. They also paid for its completion.
When MAX, the ship's computer describes the animals on board, he says "That is a Feenastarus from the Pixar Elliptic". Five years later, Disney teamed up with Pixar, a fledgling special-effects computer company.
The trivia item below may give away important plot points.
David's flight to Phaelon and back took "4.4 Solar Hours," while 8 years have passed on Earth, indicating that time was slowed down for David by a factor of about 16,000, which corresponds to a speed of about 99.9999998% the speed of light.