Other mistake: During the shots set in Los Angeles, a group of pedestrians can be seen looking directly into the camera and smirking.
Visible crew/equipment: Just before the second fight with Clubber and just after the pre-fight brawl, when the camera switches to the shot of Rocky and Apollo you can see a director's chair at the top left of the screen with "Mr. T" written on it. (01:22:50)
Visible crew/equipment: At the end of the movie during the rematch, a movie camera can be seen filming during several shots of the fight. This is a film camera and not the video type used for news or TV broadcast. Also, it's the only one seen at ringside and the cameraman has an assistant following him the entire time.
Visible crew/equipment: During the second fight, there's a brief shot looking at the opposite side of the ring. A large motion picture camera and its operator are blatantly visible in the crowd.
Answer: A detached retina can be fixed with surgery, and since Rocky is now well-off, we can assume he did just that.