Best comedy movie mistakes of 1963
Character mistake: On the day Rebecca arrives home, Junior Douglas says that he was "Valedictorian, Class of '95." Earlier, Drago talked of almost killing Running Buffalo "during that trouble back in the '40's," which would have been about 50 years earlier. That would mean Drago and McLintock were fighting Indians when they were babies, or possibly before they were born!
Continuity mistake: In the scene where the two men are carrying the coffin with the cross on it down to the crypt, the coffin is being held with the cross pointing towards the last man. But in the next shot the cross is pointing towards the first man, as the coffin has been turned around. Then in the next shot the coffin is in its original position, with the cross pointing towards the last man. There is not enough time for the coffin to rotate this many times between the two men carrying it.
Factual error: Luki shows up late at night to retrieve his baseball cap from the house where Amelia is staying. He explains that the hat is very important to him because it was signed and given to him personally by Stan Musial. Stan Musial played his whole career for the Cardinals, but the cap is a Boston Red Sox cap.