When Robert enters his Lancaster he enters through the rear door and turns left. He then proceeds to the pilot's seat at the front of the aircraft, however as he entered through the rear door and turned left he should head towards the rear gunner's position at the rear of the aircraft. When his Lancaster takes off he also incorrectly advances the throttles on his own - his flight engineer would also advance the throttles eventually taking over, allowing the pilot to use both hands on the control column.
Simon Goldberg, the Jewish character based on the historical Viktor Klemperer, lives with his non-Jewish wife in an apartment that they have for their own. By early 1945, the real Viktor Klemperer, a Jew who had converted to Protestantism, lived with his non-Jewish wife Eva perched in a so-called "Judenhaus," a house where numerous Jewish families had been put up and kept with only basic provisions. For years, families like that of Viktor Klemperer had been isolated from the non-Jewish German population, and it would have been unthinkable for the wife of a Jewish German to work at a hospital.
In using stock footage to depict the wartime bombing of Europe, some of the footage, seen just before the scene where two British officers are arguing over the value of bombing German cities, shows a US B-29 Superfortress. Such bombers were never used in the European theatre of World War II - they were only used against Japan.
In the English language version, during the bombing raid early on in the film, the British airmen in the bomber refer to enemy aircraft being at 'oh-eight-hundred hours' and 'oh-twelve-hundred hours'. This is clearly a mistranslation of the usual RAF way to refer to enemies by positions of the clock, in this case eight o'clock or twelve o'clock.