After you upgrade a lot you will get a bookcase on the bottom floor next to the fire place. Occasionally a blue book will glow.
Click on the book and it will open a scroll with a list of things you need to click on. Some items on the list will be outside.
From memory
- Bone Marrow = Skull on bookshelf on top level
- Squeaky Hinge = Clock
- Eye of House = The eye on the outside of the house
- Bubbling Brew = Witches cauldron outside