Visible crew/equipment: In the scene where Joey Zaza is murdered, one of his henchmen gets gunned down with a shotgun. Just before the blast hits him, the side of one of the wooden street stalls magically changes to a breakaway so he can crash through it dramatically, instead of just slumping down against it as he would in reality.
Visible crew/equipment: When Zasa's two henchmen try to kill Vincent and he shoots the second one through the hand, you see a bulge in the guy's palm just before it explodes to create a 'hole'. (00:34:30)
Answer: It shows you how greedy they are even as they've made it to the zenith of their criminal careers. That's why you see Michael pass it on disgustedly and stare blankly into the ether. Michael's goal was never to be the boss or capo di tutti capi, he only did it to protect his father and then his family, his main goal. And at that moment he realises he's never getting out. He's a business man in a world of criminals (which he is himself).