Found an issue when upgrading in the village. If you click the upgrade button on someone who's actively upgrading, it still charges you the materials for the upgrade, and it doesn't stack the upgrade if you do. Like if i click it twice i pay the materials twice, but I only get one upgrade.
Edit: It's a little nitpicky, but the resource drops for the town are in order, except that the rats' tails and bat wings are flipped.