Hidden details in your Springfield?

I have two Wailing Walls in my town: one of them in a garden area featuring the Escalator to Nowhere, and the other one in the backyard of the Pumpkin House, which serves as Witch Marge's lair. The way I see it, the suicides from the escalator are absorbed into the Wailing Wall, and then they are mirrored in the Pumpkin House's backyard. Essentially, this is the source of Witch Marge's power.

Also, sometimes when Witch Marge is stirring the cauldron in her backyard, Moe sneaks into the bushes to watch her evil.