Goofs

The Princess, naked after her bath, has bikini tan lines.

Potatoes originated in the Andes, in South America. They were introduced to Europe in the middle of the 16th century, and were a staple food about 100 years later, well after the feudal era.

During the tournament, the flags are raised on modern metal poles.

During the fight in the quarry near the end of the film, when a knight falls off his horse, the side of a prop truck is clearly visible behind him.

When the fanatics parade through the village, rolling a huge wooden wheel before them, a stack of camera equipment, partially covered with a blanket, is visible in the background.

At the end of the film, visible wires hold up the monster's head.

Wire visible pulling a knight off his horse is during the first jousting scene.

Wire visible pulling a piece of a knight's armour when he flies through the air and slams against a wall during the first jousting scene.