User blog comment:Darkcloud1111/''The Mark of Athena'' Plot Holes/@comment-153.107.33.151-20121010023019/@comment-3146930-20121010024344

The Jason vanishing/appearing thing isn't that much of a plot hole. I mean Percy vanished for 8/6 months. Jason could have been asleep for 2 months and appeared at Camp Half-Blood when the time was right, just like how Percy appeared at Camp Jupiter when the time was right.

As far as Percy and Annabeth, I think Rick made Annabeth say four months as a way to fix the time-line.