More lore can be found, if one looks for it, making the vicious underground world John has to go back to seem like Alice's fall in Wonderland. Charon, the Hotel Manager of the Continental, reminds John Wick of the importance of neutrality in his hotel, of no rule breaking, no killing or violence within the establishment on punishment of 'termination of club membership'. This can perhaps be
like Papa Midnite's rules in his club in 2005's film 'Constantine'. Going further, Charon, in Greek Mythology, is the ferryman of Hades, the protector, of sorts, of the underworld. Hence, in the scene when John pays Charon in a gold coin, Charon places it in his pocket, as a payment for safe passage.