YMMV / Masters Of The Air S 1 E 04 Part Four

• Genius Bonus: What led the Belgian Resistance Interrogators to their conclusion that "Bob" was actually a German Infiltrator? The reasons are quite simple actually:
  • "Bob" wrote the current date in the European day-month-year style rather than the American month-day-year style, as the two genuine American-airmen do.
  • He sings the American National Anthem with total confidence, even when he flubs a line; whereas the two airmen struggle to remember the lyrics as they nervously sing it.
  • And finally, when one of the Belgians asks "Bob" for a light, eagle-eyed viewers would see that the lighter he has is not an American "Zippo" lighter ubiquitous to the US Military during WWII, but rather is an Austrian "IMCO" model.