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Given the obsessive-compulsive interconnected density of the Lost universe - - -and the obsessive-compulsiveness of its fans, myself included, in sifting for clues amidst the seemingly random matter- - - it's not that easy to dismiss the recent sight of Hugo reading a Spanish-language edition of Y: The Last Man, Vol. 3: One Small Step as just Brian K. Vaughan indulging in a bit of cameo self-advertising.
This particular arc ,after all, was about returning astronauts on an Earth radically and eerily changed and the race among factions to receive them. Before that, somebody was reading a Green Lantern comic with a polar bear in it and look where that led to.
So. Red herring? Or easter egg?