The Karate Kid III

Other mistake: When Miyagi throws Mike into the light switches, the lights go out but the switches never change position.

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Other mistake: During Daniel's match with Barnes, Barnes kicks Daniel in the groin and the referee warns him that one more illegal move will get him immediately disqualified. After the warning, Barnes sucker punches Daniel in the back of the head. This should have gotten Barnes an immediate disqualification but the ref lets the match continue.

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Suggested correction: Actually the kick to the groin was the first infraction that Barnes committed. It was the punch to the face (not the back of the head) that got the final warning.