There's definitely a bug with the items you find. The goo from the shop goes onto the floor first time you click it, then you gotta click it again before you actually get it in the potion room. The secret key doesn't seem to work either, it either goes to the roof chest and just floats in the air or it goes behind the chest and floats at the wall, not unlocking anything. The little white ball in the bedroom goes down to the shop, same spot as the goo, however this one you cannot click on and get it like the goo, it just stays there.
That's all I could find with the limitations from not being able to open the chest.