Red Light, Green Light - S1-E1
Corrected entry: In the first game, the players must run after 'Green light' is said and stop moving when they hear 'Red light'. At the start, most players slow down considerably and then stop just before 'Red light' starts to be said. This is especially obvious in the English dub, where the song has been removed and players would not be able to predict when 'Red light' would be said.
The Man with the Umbrella - S1-E3
Continuity mistake: When people start dying during the dalgona game and people start getting eliminated from the floor of the control room, you can see one of the screens on the left showing a player licking the back of his cookie. People don't start doing this until they see Gi-hun come up with it, and he hasn't had that epiphany yet. (00:39:26)
Trivia: They keep guessing the next game, however clues are hiding in plain sight. The illustrations on the dormitory walls depict all the games, from "Red Light, Green Light" to the final match of Squid Game.
Correction: They can't predict it, but they're all being understandably very cautious. The gap between green and red is never too long, so they're just trying to make sure they're not still moving when "red light" is said.
Jon Sandys ★