This movie has nothing to do with the original book. It was created by the order of German politicians in attempt to make the world believe that Germans didn't want war and justify WW2 by humiliating peace treaty Germans were "forced" to sign. It is disgusting that country responsible for not one but TWO wars that ruined millions of lives wants to make everyone believe that they're pacifists and victims. If you don't believe me find out how they teach history in German schools. Millennials don't even know that Germans were killing Jews and even if some were killed, it was not more than in other countries of that time.
To sum up, it's not a movie, not adaptation of the book but simply propaganda, waste of time and brainwash that you paid for.