Continuity mistake: When Dong-mae slits the throat of the Japanese official, a few streaks of the man's blood suddenly appear on his nose that weren't there a couple seconds prior. (00:25:30)
Continuity mistake: Gwan-su stands outside the American legation. In a wide shot, we can see one of the ribbons used to tie his hat with can be seen going over his left shoulder. In the next shot, the ribbon is suddenly off his shoulder. (00:38:48)
Continuity mistake: When Eugene and Ae-sin are standing by the river, in the shot where Ae-sin says "longing, flower-gazing", nothing can be seen in Eugene's hair. When the camera cuts to Eugene, a tiny petal has suddenly appeared in his hair. (00:49:28)
Continuity mistake: When Ae-sin and Hui-seong are kneeling on the ground, in a wide shot, their shadows cannot be seen on the ground beside them. But later in the scene, when Hui-seong takes the handkerchief, their shadows can be seen on the ground next to them. (01:14:30 - 01:16:15)
