How much is the standard for plagiarism?

How similar is it to plagiarism and how much is it not?
Or what's the difference between homage or parody and plagiarism?
Today, I'm going to compare several movies
Let's think about the plagiarism problem together.
I'm making it clear because I'm afraid you'll misunderstand.
I'm not saying that all of these movies are plagiarism... No.
Some of them are plagiarism, homage, or inspiration
There's a mixture of things that are just the rules of the genre.
I'd like to think of these movies from a variety of perspectives with you.