Space Flag - S1-E5
Other mistake: The kill counter on the screen displays the wrong counts... should display "Space Force 14", "Air Force 15". (00:26:08)
Episode #1.1 - S1-E1
Other mistake: Weol-ju goes into the forest at night and sees her house has been set on fire. From where she is standing, there is a large distance between her and the house, and the fire is so huge, that she can see it all the way from the forest. She then runs back, and given the distance between the forest and the house, should have taken a while, but the house is still in the middle of burning down when she arrives. The fire should've definitely worsened during her run back to the house. (00:12:23)