Episode #1.4 - S1-E4
Other mistake: Kang-bae is shown following Yeo-rin whilst walking on the sidewalk. He looks at his hands for a few seconds, then when he looks back up, he realises Yeo-rin has noticed him, turned around, walked towards him and is standing directly in front of him. There's no way he wouldn't have noticed her whilst she was walking up to him. Even if he was looking at his hands, he should have seen her walking to him in the corner of his eye or at the very least, heard her walking up to him. (00:13:00)
Episode #1.4 - S1-E4
Other mistake: The coworker who computerised the old database takes a huge bite out of an apple. But in the following shot after this, the man doesn't appear as if he took a huge bite out of an apple at all. His mouth is suddenly closed and the movements of his mouth after biting the apple are relatively light. (00:37:37)
