I watched that video -- maybe I followed a link from your journal. And I sent a link to the spouse, who said, "They all sound like pirates!"

Pirate linguistics would probably be a fascinating field of study except that there probably aren't a lot of written sources.

When I lived in the NC mountains, people told me that dialects could vary noticeably from one 'cove' (valley) to another, but I never heard any difference. Most of the people I talked to were from someplace else anyway.

Also, I used to work with a bunch of guys from the north of England, and one of them had a noticeably different accent, which he said was because his mother was from Scotland.