> It makes zero difference to the movie watching experience if the script line came from the script or the other way around.
I disagree; if it's a quote that serves the narrative and isn't jammed in as a reference it doesn't have the same effect as the meta examples. Less of a fourth wall break.
That’s just called good writing. You could decide on a title first then skilfully add it as a quote that servers the narrative. Again, as an audience member you don’t know¹, except when it’s glaringly bad. It’s the toupée fallacy.
¹ I hope it’s obvious I’m excluding cases where someone deliberately seeks behind-the-scenes information. We’re talking about having only the result of the work as context.
It’s like anything in film. The viewer can speculate how it was constructed based on evidence in the work itself. The writing divide is certainly not the only source of evidence.
More generally we are not limited only to the film when trying to categorize based on this distinction. The distinction exists even if it is not always discernible.
That said, I think trying to construct separate lists based on this distinction would be nearly impossible.