While the Baron is interrogating Ms. O'Hara at the hotel in Paris (after the photographer is killed and she's arrested), the cross suspended from the Baron's neck disappears and reappears between shots.
Famous footage of Adolf Hitler visiting Paris is shown. Following this, many scenes (and many days) occur before the Baron is called in to see Hitler, yet it is well-recorded that Hitler's visit to the city lasted only 3 hours.
The story starts in 1938 and continues through 1939 and 1940 but all of Ginger Rogers' clothes and hairstyles are strictly 1942.
The photographer says that seven countries have already fallen. At this point, actually eight had: Austria, Czechoslovakia, Poland, Denmark, Norway, Luxembourg, Holland, and Belgium.
(at around 1h 50 mins) The ship's captain is supposedly playing bridge. However, the four card players are clearly playing a completely different game.