Your devotion to the craft of this film and to the spy film is admirable and appreciated. If you did not have the screenplay, I can only say that listening to dialog and writing it down is a difficult and annoying thing to do. The few times I've done a bit of transcription, I discovered that what I think I hear is not what actually is said. Years ago I had a heated conversation with someone. I certainly did not tell him, "f**k you", yet about a year after that, he accused me of saying exactly that and he believed it. Human communication is actually quite a fragile medium.
Side note. My first bad print was blipped out from WGN. I placed it in my film noir section of my list and considered it an overlooked rarity. When Fox showed it many years later, for some reason, I placed it in my spy section. I've at times moved films back and forth between these two categories, whatever would better serve a memory needing help.