Tower Windows
Flying up to these windows and walking in the corner of them on the tower allows players to glitch inside the tower.
Wall Hole
Where the walls near the Tower are, holes can be found and entered.
Games Roof
You can clip through the roof of the games building.
Casino Roof
This roof is also clipable, allowing you to move throughout all the levels.
Rocks
You can walk through all rocks. Some rocks even let you clip out of the map, and I even found a cave!
Between Theater and Arcade
There is a gap between these two, allowing for players to fly out of the map.
If you find anymore, please post them in the comments!