Factual error: During the period in which Apollo is trying to bait Rocky into a rematch, Rocky puts the TV on and sees a sports report in which Brent Musburger announces that the Los Angeles Rams defeated the Tampa Bay Buccaneers on a late field goal by Frank Corral. The movie takes late 1976-ish. The Rams did not play the Buccaneers in 1976, and Frank Corral did not join the Rams until 1978. The game in question occurred during the 1978 season.
Factual error: Early in the movie, in the scene where Rocky is taking Adrian home from their wedding, they are seen walking under the elevated subway train (the Market-Frankford "El"). Rocky lives in South Philadelphia (in Rocky III he said the Spectrum in South Philly was "10 minutes from my house" so he didn't move), where the subway runs underground.