- Ascended Fanon: Of a sort. A popular fan-created mock cover for The Blood of Olympus was licensed by Disney to appear as a poster in the Wal-Mart exclusive edition of the book.
- Promoted Fangirl: Viria, one of the most popular fan artists for the series, ended up getting commissioned to make official character portraits on Rick Riordan's website.
- Refitted for Sequel: The second book's title, The Son of Neptune, is a variant of The Son of the Sea God, the original title of The Lightning Thief. Rick had to change that when his students pointed out it spoiled the identity of Percy's father.
- Trolling Creator: Riordan dedicated the fourth book House of Hades, to the readers.To my wonderful readers: Sorry about that last cliff-hanger. Well, no, not really. HAHAHAHA. But seriously, I love you guys.
- He apologizes for this in the dedication for the fifth book, but says:I'll try to avoid cliffhangers in this book. Well, except for maybe a few small ones... because I love you guys.
- He apologizes for this in the dedication for the fifth book, but says:
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