Factual error: On the wooden globe in Eugene's office, China is listed with the name "People's Republic of China." This name was not first proclaimed until 1949, whereas this episode takes place in 1903. (00:27:28)
Continuity mistake: When Hina is sword fighting with the Japanese soldier, and he slips over, in the overview shot, he is shown dropping his sword. When they go to help him up a few seconds later, the sword is now in his hand. (00:16:48)