Episode #1.5 - S1-E5
Continuity mistake: When Kang-bae is speaking with Yeo-rin whilst she is putting some trolleys away, she is shown with her arm outstretched, placed on the trolley. In the next shot, her arm is at her side. Then in the next shot, it is outstretched again. Then at her side again in the following shot. (00:26:44)