Character mistake: In the scene where Spider quotes from the Bible to Rocky before the fight, he quotes the verse as Zechariah 4:6 and then quotes the beginning of that verse but the end of another verse, 1st Corinthians 15:57.
Character mistake: During the press conference Paulie's last name is spelled differently than it has been in other films and online.
Answer: Stallone himself answered this question in an interview. "When Rocky was diagnosed with brain damage he never went for a second opinion and yielded to his wife's wishes to stop. So with the advent of new research techniques into brain damage, Rocky was found to be normal among fighters and he was suffering the results of a severe concussion. By today's standards Rocky Balboa would be given a clean bill of health for fighters.