When El Greco is defeated, he will throw his sombrero before dying. And if Cormano is a player selected, he will catch the sombrero and wear it for the remainder of the game.
Chief Scalpem is the only boss character to not actually be killed when he is defeated.
Likely to avoid controversy, when it was ported to Super Nintendo, the Native American level was changed; as well as the name of its boss. The various Native American enemies were replaced with the generic cowboy enemies seen throughout the rest of the game. And the boss character's name was changed from Chief Scalpem to Chief Wigwam. His fate ultimately remains the same, though. Since, as mentioned elsewhere in this trivia section, he is the only boss character to not be killed when defeated.