Historical accuracy depends a lot on the setting, but what really annoys me are things that go against the game world. For example a game world that assumes earth's physical laws and real world materials, yet uses them in ways impossible by physics ("but...but...it's magic!"). Buildings that would likely collapse on…
That's not a lot to go on... How much fantasy is fantasy ? Yet Historical ? You can post examples of what you're thinking of, you know. Honestly, I just look for things that catch my eyes. Like, this. Fk, hhhhnnnnnnnnnnnnnnnnnggg !