Deliberate mistake: When the saloon patrons pour through the swinging doors in pursuit of Packer, the same people are seen repeatedly. A relatively small number of extras are running around to the rear of the set and re-entering through the back so that they will appear to be a larger crowd of people.
Deliberate mistake: The movie shows events between 1939 and 1945 but the children look the same at the beginning and the end, they don't grow up. Pay attention to Danka Dresner, Adam Levy and Olek Rosner.