The banners are different colors and the monorail strut is made of metal while everything around it is made of wood and brick.
The gameworlds lobby seems more tucked away and feels uninviting to me.
The inside and outside of the tower seem dark compared to the lighter tone of the stores and boardwalk. Project 12 does not seem to be dark like the rest of the tower.
The inside of the monorail is dark as well as the windows, there are no seats in the monorail.
The textures on the Poseidon and bumper cars buildings are very different from the ones used on other buildings.
You are unable to change the lights on the surface in the underwater condo map.
All of these statements except for the previous are simply my opinion.