The Man with the Umbrella - S1-E3
Plot hole: With all the cameras and guards watching, there's no way anyone would be able to use a cigarette lighter to help them pass the game.
Suggested correction: The guards do not care about cheating as long as it doesn't break the rules of the game or challenge the integrity of the games. Using a lighter was not explicitly forbidden by the rules, so even if they saw it (which is not guaranteed), the guards wouldn't step in.
Other mistake: SPOILER! The fourth game (the game with the marbles) can only be won when you win your opponents' 10 marbles and hand over a bag with 20 marbles (as is shown at various points during the game). But at the beginning of E7, Seong Gi-Hun (the main character who defeated the old man) takes a marble out of his pocket. This means he handed over only 19 marbles and should have been eliminated.
Suggested correction: Players simply have to show they have all 20 marbles. There is nothing in the rules that requires them to hand over a bag with all 20 marbles. In several cases, we see the losing player killed without the winning player handing over a bag with 20 marbles. When Gi-Hun is given the last marble, he doesn't hand a pouch full of marbles to the guards. He simply walks away and, knowing that Gi-Hun has won, the guards allow him to leave.
