It's really annoying to see so many people on both sides getting so hot and bothered about it. It's simply a story, for goodness sake!
I am sure the author would love what you said that about hearing the dialects and accents. She said for her the cadences of the dialogue/dialect were so important to hear as she wrote them. She could hear them deep inside of her as she wrote. What a great perception you have to enjoyed that additional layer to the book withe the audio :).