Everybody loves Hypnotoad!
The reason that you start in the mayor's residence is that its entrance is has index 0. Since the game doesn't recognize that owl statue as a proper save point, it probably just saves 0 to your "entry point", and thus plops you into the Mayor's House when you reload.
EDIT: well, it's not index 0, but I think it's the lowest one. It's somehow the default one, though.
EDIT: well, it's not index 0, but I think it's the lowest one. It's somehow the default one, though.