During development, the nursery was originally called the "Child's Room", and Chauncey was missing. Instead, the room was filled with ghosts. A stuffed rabbit and two teddy bears were to the far right on a shelf and the different styled crib and mat were further away from the wall. After beating the room, coins and a normal key would appear out of a treasure chest, as for what door uses that key is unknown. It's unlikely it would have been for the Area Two door, but possibly not, as the door was accessible from the start.