Episode #1.1 - S1-E1
Continuity mistake: When the soldiers enter the room after shooting Ae-sin's mother, she is shown lying on the floor. She then turns around and shoots one of soldiers whilst lying on the floor, but when the second soldier shoots her, she is suddenly standing up. (00:58:25)
Episode #1.5 - S1-E5
Continuity mistake: Gwan-su and the interpreter get into a kerfuffle. Gwan-su is shown holding onto him with one hand, but in a wide shot, he is suddenly holding onto him with both hands. The interpreter is also suddenly holding onto Gwan-su, something he wasn't doing in the previous shot. (00:52:30)
Episode #1.5 - S1-E5
Continuity mistake: When Gwan-su grabs the interpreter by his robes, the ribbons used to tie the man's hat can be seen in Gwan-su's fist. The ribbons are positioned towards the interpreter. Two shots after this, the ribbons are suddenly pointed to the right. (00:52:22)
Episode #1.1 - S1-E1
Continuity mistake: An accessory on Lady Yun's dress is thrown on the ground toward Yu-jin. It is shown landing mere inches from Yu-jin, but around ten seconds after this, when Yu-jin begins to get on his knees, it is suddenly about a foot away from him. (00:14:50)
Episode #1.1 - S1-E1
Continuity mistake: Ae-sin is reading a book whilst a peddler prepares a collection of broaches for her. When the peddler finishes saying "What do you think, my lady", Ae-sin's right hand can be seen touching the bottom of the right hand side page. When the shot cuts, her right hand is nearer towards the middle of the page. (01:10:05)
Trivia: Daily Mail journalist Frederick McKenzie takes a photo of the Righteous Army, which is stated to be the only existing photo of Korea's freedom fighters. This photo is a direct recreation of a real-life photo of the Righteous Army, taken by Frederick McKenzie (who was a real-life war journalist) and is to date, the only existing photo of Korea's freedom fighters. (00:30:12)