Luxurious Mansion - in the harem room there is a button on the fountain/bath on the wall side, it changes the lights, which illuminates hidden buttons through-out the room, there are 3 I think, they will disable the shield
The Asylum - I myself remember reading it on a note, but I don't remember exactly, something about changing the password to Thunder?
Key under zombies - yes, you must choose to burn them to move the pile of zombies off the key.
