Deliberate mistake: When Kalidor beheads a warrior and when Sonja beheads the wizard, both heads don't fall sideways as they should, but instead fly upwards, revealing they were tossed by someone offscreen - which looks more impressive, indeed.
Red Sonja (1985)
1 deliberate mistake - chronological order
Directed by: Richard Fleischer
Starring: Arnold Schwarzenegger, Brigitte Nielsen, Sandahl Bergman, Paul L. Smith
Revealing mistake: In the scene where Sonja's sister is escaping from the temple she is shot with an arrow whilst on an aerial slide. Her body hangs limply and is met at the end of the slide by Kalidor. However, the limp body is a stunt *man* in drag.
Prince Tarn: Why does she fight so hard? She doesn't want to win.