Unlike the other switch palaces, you can't return back to press the switch in case you haven't already done so.
The level cuts off at the very end.
Mismatched palette on the cannons that fire splitting Bullet Bills.
The room with the second SMWC coin has a broken exit.
Noticed a missing tile.
This particular tile is no longer solid throughout the level.
Bad GFX on the sprite-solid blocks. Also the boos are somehow able to pass through them.
There's a missing tile here.
The Fire Bro. just fell through the ground here.