Factual error: At approximately 27 minutes in, when they part company at the airport Douglas is wearing a Combat Infantryman Badge. The CIB was not created until Oct of '43, though the scene was taking place at the end of '41 - early '42. (00:27:05)
Factual error: In the scene where Nina is in the "secret room" in the basement of Franz Dietrich's mansion and is taking photos of secret documents with her spy camera, one of the documents she photographs details the location of the secret bomb-making factory at "Peenemuende". The location of Peenemuende on the map is marked as being in the midwest Ruhr region of Germany, whereas Peenemünde in reality is located at the north-eastern part of Germany on the North Sea.
Factual error: When Von Karajan appears conducting the orchestra at the concert he looks around 55 years old. Around 1943-1944 Von Karajan was 35-36 years old and should look younger.