Trivia: Sarah Douglas' voice was dubbed over by actress Annie Ross who would play Vera Webster in Superman 3. Sarah's own voice was used in Superman 2: The Richard Donner Cut.
Trivia: One of the special thanks in the end credits is to the Argon Oil Company, a fictional company in another ZAZ movie, "Kentucky Fried Movie". Argon is actually an elemental gas. (01:26:50)
Trivia: In his biography, Gene Kelly has admitted that he knew Xanadu was a bad film, but found Olivia Newton-John a joy to work with and she helped him survive it.
Trivia: Brooke Shields had to stand in a ditch in some parts of the movie because she was much taller than her co-star.
Trivia: The voice for the animated Popeye was done by Jack Mercer who provided the voice for the Popeye the Sailor cartoons.