Writers don’t write in one draft. They can tweak the book as much as they want, so they can add or modify hints or foreshadowing or clues to fine tune the story, for your usually more linear reading experience.

Personally I don’t think acronyms like GIF have a “correct” pronunciation. A favorite pronunciation might emerge by consensus, but not by rules. Sure “graphical” might have a hard ‘g’, but if you spelled the acronym out you would say ‘jee eye eff’ because once detached from the word, that hard sound is lost. If there were an organization Christian American Charities and the acronym was CAC, would you pronounce it kak, chatch sass cass, or what?

Hugh Laurie wrote a James Bond-ish spy thriller/comedy novel

Salinger does nothing for me. His characters are morbid and dimensionless as far as I experience them.