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In chapter 604 Oda slyly drew Luffy picking his nose and stick the booger on Usopp’s arm.

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No one noticed until Oda himself (through his former editor Naito) revealed this gold in One Piece Knowledge King quiz event held in Japan last year.

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Naito added that Oda drew the scenes while laughing uncontrollably and looked forward for readers to point it out in SBS. It kinda made him a little sad that it went unnoticed. Never change, Oda.
*by GatlingGooner