Trivia

None of the locations were stock footage, since this was one of the first CinemaScope movies. The locations were shot by a second unit in England during the spring and summer of 1953, specifically for this film. Stand-ins doubled for the principal cast in long shots, which were then matched at 20th Century-Fox studios and ranch in California during the autumn of 1953. The English stand-in for Janet Leigh's Aleta character was a teenage Shirley Eaton, (later to become the James Bond Goldfinger (1964) girl).

Since Prince Valiant's years-in-the-telling story line in the comics was so sprawling and complex, the property is said to have languished at MGM, where no writer could get a handle on it. After MGM eventually allowed its option to lapse, it was picked up by Fox. There, Oscar-winning screenwriter, Dudley Nichols, devised a script by selecting panels from the comic strip to create a much more concise storyboard from which to work.

Robert Wagner writes in his memoirs that he was miscast in this film.

Alnwick Castle in Northumberland served as Camelot in all of the panoramic CinemaScope shots, whilst Warwick Castle was used for the main gate and courtyard. Although Alnwick is made of brown sandstone, and Warwick pale gray granite, carefully placed cameras, use of filters and post production color timing masked the difference in hues.

Some location shooting for the picture was done at the Arroya Sequit, Sherwood Forest and the Rowland V. Lee Ranch in the San Fernando Valley of CA. Numerous locations in Great Britain were used, including the village of Dornie, Braemar Castle at Aberdeenshire and Eilan Donan Castle at Loch Duich in Scotland; Alnwick Castle, Northumberland and Warwick Castle, Warwickshire in England; and Caernarvon Castle in Wales.

Primo Carnera, who played Sligon, had such a thick Italian accent that his voice was dubbed.