The edition I have has some excerpts from an interview he did way back in the day and he talks about how he had to produce different scripts for adaptations and how the story had evolved over time. His solution was when he had to change the script everyone either said the same things for different reasons or different things for the same reasons. It made it feel like the story was always kind of fluid for him.
Edit because lemmy is such a small world and I just found myself agreeing with you again
What's really the most annoying though, is listening to whiny "critics", like yourself, cry about how popular they are all the fucking time.