Well, this is what I found today:
The Marquis' (extremely slow boat) propeller at the end of the boat will not spin even though the boat its traveling
Park a car anywhere on that very windy road in SF near the Safehouse you can buy and make sure the leaves of the trees cover the camera so you can only see it. You will notice that, like that mysterious water in the Countryside, when the leaves cover the camera, the cars disappear, yet when you move the camera away from the leaves the cars appear again.