The way both actors were going at it, Stallone and Weathers might as well have been in a real fight. In an interview with Roger Ebert in June 1979, Stallone explained the extreme level of punishment he endured, saying, “I got all beat up inside, I had to have an operation to splice things back together. The mouthpiece saved my teeth. For this one, basically what I need is a mouthpiece for my whole body.”