Episode #1.3 - S1-E3
Continuity mistake: When talking about relationships in the coffee shop, Jin-a asks "But what if we keep missing the right time" and her friend is shown with a drink on the table. The straw inside the drink is shown at a tilted angle when Jin-a says this, but when it cuts to the friend, the straw is suddenly at an upright angle. (01:15:08)