During the opening cut scenes you can see another Isabella in the library section of the building.
The game can become stuck if you stand in the final spot of the goblin as she creates the gravity crown.
During the Isabella book scene, there were two models of her, one moving around and one standing where she got the book from the shelf.
During rainy days Ava is stuck in a corner of the bathhouse not animated and blocked by Mara.
Moorella's model disappears during the rain in the morning.