In addition to her credited role in the mask as "The Hag", Vampira - as Maila Nurmi - also played (uncredited) the role of the sorceress who kidnaps Princess Helene.
Though the film was subjected to the usual Mystery Science Theater 3000 (1988) skewering (in Mystery Science Theater 3000: The Magic Sword (1992)), the makers of the show admitted (in the Mystery Science Theater 3000 Amazing Colossal Episode Guide book) that "this is actually a pretty good movie."
When the pinhead henchman drops the cage of little people, they are seen completely escaping; yet a moment later they are seen escaping again from a different angle.
The knight Anthony is introduced as "Sir Anthony of Italy" but Italy did not exist as a country until 1861... long after the supposed setting of this film.