Count von Dürckheim-Montmartin was 16 years old when the German War of 1866 happened. In the movie he is portrayed as a man in his 40s.
Richard Wagner's dog Pohl, who lived with him in Munich until 1866 was a big brown hunting dog. In the movie he is portrayed by a white Swiss Sheppard dog.
The Bavarians did not capitulate at the end of the German War 1866. They had an armed truce which was signed later in a peace treaty with Prussia and their allies.