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)
Continuity mistake: At the diner when Tsunoda and Retsuko are talking, Tsunoda pulls out a red phone with a white heart on it from her purse. In the close up she is pulling it out with her left hand and the phone is horizontal with the heart on its side. It then cuts to a wide angle and suddenly she's holding the phone upright with both hands.
Episode #1.3 - S1-E3
Continuity mistake: When Jin-a meets up with her friend in the coffee shop, she hands the friend a drink. The friend is shown placing her left hand on the side of the cup and her right hand on the straw. The camera changes angles and both hands are suddenly off the cup and straw. (01:14:49)