Kelly’s Heroes, the scene where they are strafed by friendly fire. The plane they use wasn’t an actual WWII airplane, just one they dressed up to look like one. Also all the German light infantry rocking sub machine guns instead of Mausers. Other than that, great movie.
Prompts a fun question: whats the most niche historical inaccuracy in a piece of work that annoys you Not like 'oh they were referring to the wrong king' , more 'they had the wrong king on a banknote in one scene'