Episode #1.8 - S1-E8
Continuity mistake: When Kang-bae is speaking with Jin-dong and another co-worker at the supermarket, in the shot of Jin-dong saying "Come to think of it, shouldn't we have a get-together with the prize money", the co-worker can be seen holding a pretzel to his mouth. But in the next shot, the pretzel has disappeared from the co-worker's hand. (00:14:28)