Yvonne Furneaux was suggested for Andraste.
Niall MacGinnis was only cast as Menelaus after the production team failed to secure a big name British actor.
Peter van Eyck was considered for a role in this film
Harry Andrews nearly lost his part in this film when his previous film, The Man Who Loved Redheads went over scheduled filming duration.
Average Shot Length (ASL) = 6 seconds, very fast for an early CinemaScope film.
Italian reference sources "Filmlexicon" and "Colonna Sonora" both credit the music score to Roman Vlad. The most likely explanation is that the Italian musicians' union insisted an Italian member (Vlad was affiliated to SIAE) be paid to write a score, even if it was never used.
Noted British actor Edmund Purdom overdubbed in English the lines of French-Lithuanian actor Jacques Sernas on the soundtrack of this film, due to Sernas not having a firm English-speaking voice. Sernas at that point in his career was learning English but had not yet mastered the language. Purdom was not credited with his voiceover talent for this picture, as the film's producers wanted the public to think Sernas did it all on his own.
The studio badly wanted Stanley Baker to be in this film and they didn't care which part.
When Niall MacGinnis was first cast he and the production team had no idea what part he would end up playing.