I always thought the scene where Clemenza kills Carlo in the car is poorly done sound wise. The audio doesn't match what is happening as far as his kicking of the windshield, and the sound of the murder also doesn't sound like you would expect it to. It sounds tinny and fake.

"I'll give you undignified. Go fuck yourself. You, Phil... whoever. He's my fuckin' cousin."

"My name is George. I'm unemployed and live with my parents"..