I just finished re-reading this book and this time something really stuck out to me as totally wonky. So when they went todash to NYC the first time, they followed Jake on one of his last days in NY before going to the house. Later it was stated and reinforced that it was impossible to go to any time you wanted in that level of the tower because it was a keystone level. Eddie was very conscious of time passing in that world because they could not go back in time.

But they most certainly DID go back in time. Following Jake was certainly from an earlier day. And they didn't visit it on another level because all of their time counting of the days until the contract expired started from that point.

Am I missing something or is this just an oversight?