Reconsider that sentence.
“I’ve seen the movie...long before the movie”
I think you mean you read the book?
This is a cut and paste from my post:
“I've seen the movie and read about it over 20 years ago, long before the movie.”
“read about it 20 years ago “ means reading in a book about the Manhattan Project, not watching the movie.
That clear enough, Mister Dunderhead?