Most surprising 'blunder' in an authoritative poker book?

[notorious]

Oxford English Dictionary definition of 'blunder' : stupid or careless mistake (related to the word 'blind')

What are the most surprisng blunders in 'authoritative' poker books?

My nomination is p.134 of Scott Fischman's Online Ace:

"The guy who squeezed past the bubble to finish 560th in the 2005 WSOP Championship made $12,500, a 25 percent return on the $10,000 entry fee. The guy who finished first won $7,500,000, a 750 percent return on his investment."

The correct answer is surely 75,000 percent.

Or, to be more precise, because the winner is not refunded his entry fee, it's 74,900 percent. (To simplify matters, I am ignoring the additional cost of the registration fee)