Does anyone know if nazis discover nazi imposters for not using the german three fingers?

just like in the movie inglourious basterds. the englishman gave himself away for not using the right fingers when ordering 3 glasses. my father told me a story about long ago before the movie that german nazis discover imposters when they were not using the german 3. is this true? i can't find anything on the... show more just like in the movie inglourious basterds. the englishman gave himself away for not using the right fingers when ordering 3 glasses. my father told me a story about long ago before the movie that german nazis discover imposters when they were not using the german 3. is this true? i can't find anything on the internet about a story about it. does anyone know anything?
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