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
Continuity mistake: Near the end, when Red Sonja and Queen Gedren are sword fighting, the scar on Gedren's right cheek is missing.
Prince Tarn: Why does she fight so hard? She doesn't want to win.