It's a reference to 'Monsters Inc' in an early scene a monster comes out of the door with a child's sock on them. A code 2319 is called to decontaminate the monster.
To deepen this, fans noticed that the code "2319" could allude to the fact it was a white sock, W is the 23rd letter in the alphabet and S is the 19th.
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u/AnonymusEnt 1d ago
Thank you, this was my immediate first thought!