There are routine complaints from Chinese, Australian and American commentators that the Japanese school curriculum grossly misrepresents the Japanese war effort in World War II and their war in China, particularly the Rape of Nankin. I’m sure they are not alone in glossing over their national shames through careful editing, with subsequent impact on public awareness.
More generally different national traditions frame their activity in World War II differently, such as the Soviet Great Patriotic War, with the other bits as essentially side-shows. Just like how the world was plunged into the War of 1812 with nothing much else happening anywhere else.
A poll in 2001 asked Britons about the major events of the 20th century and of course the death of Princess Diana came in top.