House of Hades cover art

So as we have done in previous years, it is time to point out all the mistakes Rick Riordan made in his latest book, The House of Hades. Now we have a few already (seen here), but I'm sure we can find more.

Now this isn't limited to just plot points, but spelling errors or whatever else. Lets see if we can find as many as last year; but hopefully not.

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