I test BookNova very actively every day on various topics. Today it's the turn of the deceased. In the first chapter I announce that a person is no longer with us. And then I test whether they accidentally show up in other chapters as alive. If they do, I make corrections to the Story Thread Engine.
I feel like the Story Thread Engine will never be finished, because writing books is such a vast and unpredictable thing that there will always be some little detail that slips through the cracks.