Sylvester Stallone himself wrote the paperback novelization for this movie. The novel is mostly in first person, from Rocky's point of view, written in the same choppy English in which Rocky speaks. Scenes in which Rocky is not present (such as Apollo Creed consulting his associates, or Paulie alone with Adrian) are in standard third-person, in proper English.

When Rocky is training for the fight, he is sparring with a smaller quicker fighter. The sparring partner is played by real life Champion Roberto Durán.

In one version of the screenplay, there is a flashback scene that shows Rocky first meeting Mickey and we learn Rocky's real first name: Robert.

It took Sylvester Stallone and editors Danford B. Greene and Stanford C. Allen over eight months to edit the climatic fight scene so as to meet Stallone's approval.

Analysis by Philadelphia locals tracked the route Rocky took through the city during his training run when all the children ended up running with him. If he took this actual route from his South Philly house to the top of the Art Museum steps he would've run approximately 30.2 miles in one day - 4 miles more than a marathon.

Sylvester Stallone began working on the Rocky III (1982) script immediately after completing Rocky II, with the intention of the series being a trilogy. Originally, he had no plans to make a fourth film.

During his preparation for the film, Sylvester Stallone was bench-pressing 220 pounds, when the weight fell and tore his right pectoral muscle. This was shortly before the fight scene was to be filmed, and ultimately, the scene was shot with Stallone still badly injured.

800 local schoolchildren were used as extras for the scene depicting Rocky's run through Philadelphia.

After the bell rings, signaling the end of the second round, Sylvester Stallone and Carl Weathers are seen pushing, shoving, taunting, and ultimately being pulled apart by their respective cornermen. They continue to taunt each other before returning to their corners. Stallone revealed later they were actually angry with each other and were not acting at that point, several blows that were supposed to miss him landed and the carefully choreographed fight, which they spent months meticulously planning out, went off-track during that scene, but he liked the reaction the scene produced. He decided to leave their momentary breaking of character in and the viewing audience never realized the two actors were in reality quite livid with each other.

Originally, Adrian was supposed to be at the big fight. However, because Talia Shire was working on another movie at the time, the storyline was changed to having her stay home and watch the fight on television. The scenes of her watching the boxing match on television were shot, and then edited into the movie several months after filming once the fight scenes had finished.

During the main fight, Apollo Creed is wearing the exact same red and white-trimmed shorts as Rocky was wearing on the overhead banner with his picture during the first fight in Rocky (1976).

Sylvester Stallone's infant son Seargeoh Stallone played the newborn Robert Balboa, Jr. The role would later be played by his elder brother Sage Stallone in Rocky V (1990).

In the first film, Rocky becomes angry when Gazzo's driver suggests he take Adrian to the zoo because "retards like the zoo", insisting she is just shy. In this film, Rocky proposes to Adrian at the zoo.

On Friday Night with Jonathan Ross (2001), Sylvester Stallone was asked to give each Rocky a score out of 10. He gave this one a 7 1/2.

As he had done with the original, Sylvester Stallone incorporated biographical elements from his own life into Rocky's story for this film. In particular, Stallone used as a central plot point the concept that yesterday's heroes are quickly forgotten. In the film, this manifests itself in terms of people quickly forgetting about Rocky's exploits in the title fight. In reality, Stallone experienced a similar sense of being quickly forgotten after his two post-Rocky (1976) movies, Paradise Alley (1978) (Stallone's directorial debut) and F.I.S.T. (1978), both of which underperformed at the box office.

In the scene where Rocky is filming a commercial for Beast cologne, one of the chairs in the background reads Joe Spinell, the actor who played loan shark Tony Gazzo in Rocky (1976) and this film.

In the first draft of the script, the fight took place at the Roman Colosseum.

In the fight scene at the end, right before Rocky is knocked down for the first time it can be heard that one of the commentators calls Rocky Rambo instead of Rocky. This was Sylvester Stallone's next famous role.

Chuck Wepner, the real-life inspiration for Rocky (1976), was offered the part of a trainer named "Chink Weber". According to Wepner, he read for Sylvester Stallone but did very poorly. The character was deleted from the script. The name "Chink Weber" ended up being used for Sonny Landham's character in Stallone's movie Lock Up (1989).

During the commercial filming scene, the clapper-board reads "Director: John Pleshette", the real name of the actor playing the director. Also, Duke (Apollo's Trainer), the Agent and the Meat Foreman (played by Tony Burton, Leonard Gaines and Frank McRae respectively) are all referred to by their real Christian names in the script, while the Referee is introduced as Lou Fillipo, again the real-life name of the actor (who is also a professional fight referee).

The book that Rocky reads to Adrian is Edgar Rice Burroughs' "The Deputy Sheriff of Comanche County" which was originally published in 1940.

The film takes place in 1976.

During the ambulance drive to the hospital during the opening credits, the movie poster from Paradise Alley (1978) also written, directed by and starring Sylvester Stallone can be seen on the back of a bus.

Actor Shaka Cumbuka, who is credited as "Cornerman" for this film, actually had a name in the Rocky: Legends video game. He was called Randy Tate, and was also a playable character.

In the first "Rocky" movie, the fight poster has Balboa's shorts in the wrong color. His shorts are white with a red stripe while the poster shows them as being red with a white stripe. Balboa even mentions this error to the fight promoter in that movie. In this movie, the fight poster yet again has Balboa's shorts in the wrong color. The poster shoes them as being white with a red stripe but Balboa wears black shorts with a yellow stripe.

Part of a cycle of ring fighter movies, mostly boxing, some wrestling, initiated by the box-office and critical success of the Academy Award Best Picture winning boxing movie Rocky (1976). The films include Rocky II (1979), Rocky III (1982), Rocky IV (1985), Tough Enough (1983), Title Shot (1979), _Raging Bull_, The Champ (1979), Matilda (1978), The Main Event (1979), The Prize Fighter (1979), The Greatest (1977), Body and Soul (1981), Paradise Alley (1978), ...All the Marbles (1981) (aka "The California Dolls"), The One and Only (1978), Every Which Way but Loose (1978) and Any Which Way You Can (1980).

Before the fight begins, one of the announcers states that Apollo wants to draw "First Blood", which of course would be one of Stallone's next movies.

According to the director of the original film, John G. Avildsen, in a 1980s newspaper interview, one of the main reasons he did not direct this sequel (besides preparing for his role as director for Saturday Night Fever (1977)) was that he didn't approve of the story. He was, however, fond of Stallone's original concepts for the two films which would have made the series a trilogy. The plots would have had Rocky be elected mayor of Philadelphia on the Reform Ticket, only to be scandalized when Paulie is caught stealing from the treasury. Rocky takes the blame, is kicked out of office, and ends up penniless just as he was at the beginning of the series. Coincidentally, this is similar to a scenario that Stallone and Avildsen collaborated on for Rocky V (1990)

In the hospital scenes, Adrian's room number is 669. The number 669 is considered as an "Angel Number." This sequence in the movie shows a lot of Christian crosses and instances where Rocky is sitting in the chapel.