Using an Action Replay code, it's possible to actually walk around E. Gadd's lab. There are two doors, one of which says "Training" that most likely went to the Training room, and one that likely went to the Ghost Portrificationizer room. There is also a functional ladder, but it doesn't lead anywhere. This suggests that in an earlier version of the game the player could travel to E.Gadd's lab by means of a ladder somewhere in the mansion.