Some say, THE END isn't necessary?
If your script is written in such a way that a reader might
think there is a page missing unless you write "The End"
you have a much bgger issue to deal with than writing
those words.
It's not put "as a note" it is it's own page. You can put it or leave it. He's not talking about the actual film.You could put it on the screenplay as a note but not include it in the actual movie.
'THE END' is a bit cliched and quite limmiting. When you say 'THE END' it closes off the story entirely. It discourages the audience from speculating about what could happen after the events of the film.