The way each country portrays WWII even though it was a WORLD war. Every countries story is different, for example. American textbooks seem to skip the years between 1939 and 1942, and pretend they single handedly wiped out the Nazis in Eastern Europe, and give credit to the Russians for the west. Not a single battle is credited to a German Victory. Even Pearl Harbor isn't shown as an American loss, more of a heroic defense of "our great nation's port".
Its also bullshit how all the other countries that participated in the war seem to mysteriously vanish, and how France didn't know how to fight, Poland charged horseback against german tanks while throwing rocks, Britain hid in trenches like scared little girls, and japanese troops killed themselves before americans even started fighting