One of the easiest ways to infuse a citrus flavor into a baked good of some kind is to add lemon, lime or orange zest to it. Zest is not the same thing as the peel, or rind, of a lemon, although it is a part of the peel. The ...
Peter Hinwood, who played Rocky, did not sing, so we dubbed him. It turns out that there was a version of the song that was recorded by someone from the chorus. They were playing that version in his ear for him to mimic to. And that was the soundtrack; we've been putting it on soundtracks for 40 years.
It seems that many fans assume that when Rocky arrives at his house at the start of the film, he is returning from the sparring session with Apollo Creed (Carl Weathers) which ended Rocky III, and therefore, no time passes between Rocky III and Rocky IV.