I don't think there are any such examples, because it's something I would have noticed, but imagine if there were any clearly identifiable fans in the background on famous, valuable cards. I'm thinking of cards like the Michael Jordan and Wayne Gretzky rookies, which do have fans in the background, but nothing recognizable.
("Identifiable" not in the sense that the fan has a degree of fame of his own, but as being able to go "Hey, that's me!" without needing to resort to a magnifying glass.)
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