When holding any item (e.g Iron ingot, sword, etc ...) you are unable to click on a Furnace, workbench or chest. Still able to open doors. But to use the other 3 items I've listed you need to have nothing in your hand when you click.

Also not sure if this is a bug, or was intended. Was the carpet intended for making rugs? Or for actual carpet purposes? As I can't place anything on top of the carpets.

That is all I've encountered so far. BTW love the horses