Episode #1.5 - S1-E5
Continuity mistake: When Weol-ju and Kang-bae are speaking with the business man, he is talking about how much he loves dumplings and that his wife makes them for him often. There is a dumpling held in between a pair of chopsticks he is holding, but a few shots later, the dumpling is no longer in between the chopsticks. Later in the scene, the dumpling reappears in between the chopsticks. He was speaking with Weol-ju and Kang-bae the whole time, so he wouldn't have been able to put the dumpling down, or pick it up. (00:14:40 - 00:15:34)