The dialect is what seems to make most people uncomfortable. I really wish they didn’t put so much emphasis on it for “accuracy” because it seems that is the element that has caused the most problems. Not only is it “off” to most of us watching today, but the white southern writer they hired for this purpose clashed with the black writer hired to make sure the script was inoffensive (yes, they hired someone in an attempt to keep it inoffensive) clashed hard. The “cleanup” writer wasn’t happy with how many of his recommendations were ignored, took it to the NAACP, and that’s how those infamous protests started.