There are some interesting secrets that help you later on. If you stand in certain locations, you can use 5 AP to do something.
Right of the well to get an accessory.
Top of the button to the left of the well.
Right next to the rope on the back pillar (drops the chandelier on the drug boss level)
At the side of a bookcase/confessional to drop it.
A hole behind the farthest bookcase on the first Holy Boss level.
Beneath the salivating "moose" in the tavern.