Continuity mistake: After Sonja kills the dragon, she places a cloth on Kalidor's wound and covers it with the right lapel of his coat. Shot changes, and she is covering it again. (00:57:14)
Continuity mistake: When Sonja and the queen fight, Kalidor tries to lift the iron gate. He grabs a bar two rows to the right of where his head is. Shot changes, and he's grabbing the bar one row to the right of his head. (01:18:33)
Continuity mistake: How come Red Sonja asks the little prince and servant for directions and she takes the quickest route, yet the same prince and servant get ahead of her?
Continuity mistake: In the scene where Red Sonja is fighting some guy in front of her Master, you see it from her point of view. When she points the sword at the guy after she disarmed him, it's clearly to see that the arms belong to a man, as they are large and hairy. In the next shot, you see it from another angle and you can see her arms are placed in another position and its easy to see that it wasn't her arms in the shot before.
Continuity mistake: Near the end, when Red Sonja and Queen Gedren are sword fighting, the scar on Gedren's right cheek is missing.
Continuity mistake: When Sonja and the Queen fight in the candles' room, the ones on the right are thick, and the Queen cuts several of them with her sword. When the Prince enters, not only are the candles fixed and standing up, but they are all thin.
Continuity mistake: When Sonja is fighting against the queen, she holds her sword with both hands. Then suddenly with her left hand. Right after, the wizard makes her left arm bleed and she covers the wound with her right hand, but a shot later she doesn't. All this takes place from shot to shot in a matter of frames.
Continuity mistake: After the main tower of the Queen's castle explodes, the scene changes to the group of four trying to escape. Back to an outside shot of the castle, and now the tower is rebuilt and back in place.
Continuity mistake: The water dragon has two different designs: one for where its mouth opens and closes, and one where it barely moves. Note the shape of the ears, nostrils, and eyes.
Continuity mistake: When Sonja stabs her knife into the dragon's head, the blade bends, revealing it's made of rubber. A shot later, the blade is back to stiff.
Continuity mistake: When Sonja, Falkon, and Tarn arrive at the lava river, it flows from left to right. A shot later, the lava flows in the opposite direction.
Continuity mistake: When we first see Sonja, she lies with her right arm fully extended along her body. From the back shot, it's not.