In Demon Quest House is a room where is a chair and a Skeleton waiter. Sit on the chair in that room and the crown will appear middle of the room.
Bell:
In The Dark Chapel is a room with imps and 3 big bells. you need Hippogryph soul to get the bell. Jump with the Hippogryph souls power (up + L) to hit under the bells. try doing it on all the bells. if you hit the right one a bell will drop down from the bell.
Konami Man:
In the spike maze Tanjelly room in the Clocktower, kneel on the unspiked top area and he will fly towards you