Christopher Lee was a front runner for the role of Koura the sorcerer.
The captioner for this movie decided to have some fun with Prince Koura's lines. When he is mumbling "foreign words" to cast a spell, the captions are backwards lines from Cocoa Puffs and Trix commercials.
Takis Emmanuel is dubbed by Robert Rietty
Tom Bakr's performance as the evil wizard Koura helped him get the lead role in the TV series Doctor Who.
The actual model of the Centaur was about 13 inches high and had ocelot fur on its legs and a small doll's eye in its forehead.
When Sinbad drives his sword to the Centaur's neck a process called Shadow Boxing was used, John Philip Law played out the scene by himself pin-pointing where the sword would stop and then the Centaur's "neck" was added at that particular spot.
Just thinking up the idea of a cyclopean centaur is a long way from reality, and Ray spent considerable time designing the creature, trying to achieve a believable half-man half-horse, but at the same time making him look menacing.
Ray Harryhausen confesses that when he was animating the centaur, he had in mind an opera tenor in his final death throes.
The entire film was completed for $982,351, a remarkably small sum even for a film in the early 1970s.
Fernando Poggi was once again on board to provide his valuable expertise for the use of the sword fighting sequences. Poggi strapped two of his stuntmen together with a very large belt. This then simulated the six arms of the living statue Kali, giving the actors at least four of the six arms to practice against.
Originally they wanted to use the Alhambra palace for some of the shots but the authorities were asking for a huge fee for the rental, so they were forced to look elsewhere, eventually the found the Palace Generalife, Palma, Majorca. Other scenes were film in the Caves of Arta (the temple of the Oracle) and the Torrente de Pareis.
The miniature set for the Fountain of Destiny was huge. The monoliths were 32 inches high and the fountain was constantly maintained at a height of 51 inches. The rock background was over 15 feet high and the whole thing was built on a wooden platform 32 inches from the ground.
Actor/playwright/novelist Robert Shaw played the Oracle of All Knowledge in an uncredited role.
Marv Comics published a two-issue adaptation in Worlds Unknown #7-8 (June & Aug. 1974). Titled The Golden Voyage of Sinbad: Land Of The Lost, it was by writer Len Wein and artists George Tuska and Vinc Colletta.
Robert Shaw desperately wanted the role of Sinbad but was placated by being cast uncredited as the Oracle. His face was heavily swathed in make-up and his voice electronically altered by a sound engineer.
During production, Harryhausen was producing a film called King of the Geniis which was to include Sinbad and dinosaurs. Harryhausen made a poster and 3 key drawings, but it never was produced because of The Valley Gwangis failure, so leftover ideas became Golden Voyage.
A deleted sequence was the "Valley of the Vipers" which wasn't used in Sinbad and the Eye of the Tiger either.