Other mistake: Jim Lampley reacts to a knockdown by saying "That could be the end of the fight right there," then quickly adds "but no!" when he sees that Rocky is getting up. The problem is, we hear the "but no!" just before we see any sign that Rocky is going to get up.
Audio problem: Rocky is trying to convince Marie to work at his restaurant, outside of her apartment. The close up shot of him talking about a bus coming down the street and hitting him does not match his mouth movements, when they go to a long shot.
Trivia: Andy (Don Sherman), the bartender from "Rocky", "Rocky III" and "Rocky IV", can briefly be seen in this film sitting in a wheelchair in the background of his bar cheering on Rocky during the fight.