Continuity: The number "2" disappears off Rocky's apartment door after he answers the door to let Micky in.
Continuity: During the fight with Apollo Creed, the top of Rocky's shorts are flipped inside-out in one shot. In the next,they are fixed.
Continuity: When Rocky enters the bathroom while Mickey is visiting him, three darts are on the door. After Rocky opens the door the first time, the darts are in a completely different pattern. In the final shot, the door has 2 darts.
Continuity: During the big fight, the arena is clearly empty at times. This is because only 50 extras could be afforded for the scenes, and despite cinematographer James Crabe's best efforts to hide this fact, occasional, if one looks hard enough, one can see most of the arena is empty.
Crew or equipment visible: During the fight, Steadicam operator Garrett Brown and his assistant are visible at ringside several times in the wide shots. Brown can clearly be seen wearing a black and white stripped top.
Continuity: When Rocky sees Marie and asks her if her brother knew she was hanging out with those "coconuts", he's smoking a cigarette. When he grabs her, the cigarette disappears.
Crew or equipment visible: In the Morning Run scene, the camera zooms out as Rocky runs down the street. The lighting equipment is visible at the top of the screen, right above the farthest building.
Continuity: At the end of the fight, when Apollo and Rocky are hugging, Apollo's manager comes up to him in the close-up shot. Then they switch to an aerial shot, and Apollo's manager jumps over the ropes into the ring.
Crew or equipment visible: When Rocky is talking to Adrian on Thanksgiving through the door, the camera shot goes to Paulie who is about ten feet away. You can see one of the movie cameras in the mirror.
Miscellaneous: Rocky fights Apollo at the Spectrum Stadium in Philadelphia. As Adrian comes out to watch the fight, a Los Angeles police officer is standing behind her in the corridor.
Miscellaneous: The closing credits list real-life boxing referee Lou Fillipo, who plays the referee in the Championship fight, as "Championship Fight Announcer". Thayer David, who plays the promoter Jergens, was the fight announcer.
Revealing mistakes: After the announcer finishes announcing the beginning of the fight, the microphone rises back up to the ceiling. As it rises, it hits the camera and shakes it.
Anachronisms: About a half hour into the film, Rocky is looking at pictures and clippings on the wall, and there is the sound of a steam locomotive coming up to speed, along with the sound of its steam whistle. Diesels had long since supplanted steam in Philadelphia and most of the country in 1956.
Factual errors: Rocky was called "the Italian Stallion", and was member of an Italian-American family, but Balboa is a Spanish surname totally unusual in Italy.
Continuity: Rocky (who is supposed to be left handed) uses right hand to write down info on collections he is supposed to make in two scenes and to turn dial on combination lock at beginning of movie.
Factual errors: Jergens describes Apollo's upcoming fight as his "bicentennial fight." In the same scene, Apollo says that it will take place "on this country's birthday," meaning July 4, 1976. But the fight with Rocky takes place on New Year's Day, January 1, 1976.