I was watching a crossover video and noticed the Starman in world 1-1 hits the coin boxes ahead and bounce back. In SMB, it would jump all the way to the wooden ladder STAIRS. Damn portuguese. And if a mushroom falls through a one-wide gap it will spaz back and forth as it goes through. In SMB it wouldn't collide with the blocks while falling through a one-wide gap, instead making a perfect diagonal movement through it.