Other mistake: When Rocky is in the funhouse looking at himself, he appears to look relatively "normal". But it's very obvious that it's got nothing to do with the mirror, and more to do with the removal of a lot of makeup. For example, Rocky usually has almost no nose, but in the mirror he has Eric Stoltz's very well developed nose.
Deliberate mistake: The mirror that made Rocky's face look normal should've made his mom's face look different, but her face stayed the same.
Continuity mistake: At the end of the movie a big man is placing flowers at Rocky's grave. From the back of the tombstone he is laying the flowers on their sides. In the next shot, from the front of the stone, they are standing up, leaning against the stone.
Revealing mistake: At Rocky's graduation, when Dozer hugs him, you can see the make up wrinkle right below his eye.
Answer: According to the IMDb, so take with a degree of scepticism, Rocky's favourite music was indeed Springsteen and the Boss himself was happy for it to be used, but, at the time of the original release, an agreement regarding royalty rates could not be reached with the rights owner. A director's cut was released a while later with seven minute of additional footage and the Springsteen songs used instead, after Springsteen pushed for an agreement to be made.
Tailkinker ★