Other mistake: Player 061 was female. But an eliminated photo showed a male participant with the same number.
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.
