"Squid Game" - The Hidden Clues You Missed

The Netflix production "Squid Game" has completely blown up, and its ending is getting a lot of buzz. What clues did you miss during the show?

The marble game is the last one for Il-nam.
Source: IMAGO / Panthermedia

Let's Continue with his Very Last Game:  

While playing marbles, he wanted to avoid being part of a team because he knew in advance that whoever was left alone would not even have to compete in the game. Very noticeable. When he loses the game to Gi-hun, we probably miss the most striking detail, because no one sees him get shot or die. You hear a gunshot, but that's it. Incidentally, the game raises quite a few questions in the wake of the marble case:

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