Lt. Aldo Raine: You probably heard we ain't in the prisoner-takin' business; we in the killin' Nazi business. Business is a-boomin'.
When the real German soldiers are playing 20 questions in the bar, one of the cards shows the name of Genghis Khan. This is an English-language word; as Germans, they would have written Dschingis Khan instead. As the whole scene deals with exposing the British/American spies and subtle differences in their language or behaviour, this is especially unfavorable here.
A dummy of Quentin Tarintino is used as one of the scalped dead Nazis in the scene where the basterds are in the valley and Donny beats the German officer into a pulp.