Continuity mistake: Greg says that Hero Points are printed on sheets of 10 (page 52), but on the next page, Erick is holding a sheet of 12 Hero Points. On the page after that, the Hero Points are back to a sheet of 10.
Continuity mistake: After Gregory saying that 100 Hero Points would cost a quarter, there is an image of a boy using note cash to buy 36 Hero Points (because of another listed mistake), which is inconsistent with the price. And if those were charging more than the regular price, why didn't the boy buy his Hero Points somewhere else? (Page 53).