First things first. I don't consider regional accents as "incorrect pronunciation." So our Bostonians are all find. As are our Liverpudlians and so on. That out of the way...
When I was in fifth grade I was reading a book. One of the chapters was entitled: The Secret Rendezvous. I was a bit careless in the reading of that word and thought it was pronounced: Reh-VEN-dous. I figured out what the word meant in the context of the story, and apparently it meant Ron-day-VOO...I word I had heard many times, but had never seen written down. So for quite some time I thought there were two synonyms for a secret meeting: Ron-day-VOO, and Reh-VEN-dous.
Then, as a person who has played lots of tabletop RPGs, there are numerous words where there seem to be pronunciation disagreements.
Camarilla. I'm from California and I always pronounced it Cam-ah-REE-ah, whereas I ran into players from other states who pronounced it Cam-ah-RILL-uh.
Tzimisce. I've heard this one pronounced many, many different ways.
Drow. Droh (like Woah). Drow (like Wow).
But hey...