>Around here I've heard Fredericksburg pronounced as Fredgburg, Staunton as Stanton... but what really puzzled me is that "coxswain" should be pronounced "coxn".

Applies to a lot of nautical terms: "forecastle"->"fo'c's'le", "Stun sails"->"Stuns'ls", "Top gallants"->"To'g'llants", et al.
>
>How about bulletin? It's pronounced close to "bilten" (at least to my Slavic ears - anyway, that's the way it's spelled and pronounced in my language), but here, it's "bull-let-in".

Same in "English"

>
>And during the most of the last month, my seasonal gripe was the superhero, who is stronger than all four crews of CSI, all three crews of Law'n'Order (aka Lorder), and Starfleet and SG-1 combined: Seezen Fennelly.

Never heard of her.

Hey, you got 4 CSI's? We're only up to 3 here: LV, Miami and NY. Funnily, last night's LV episode didn't feature "Gruesome" but was filmed mainly in LA. I imagine that's where the next one is, right?

>I have only once heard a TV voice pronounce "Finnahly", and never, for all these six years here, have I heard anything even close to "finale" (finn-uh-leh).

It's "fin-ah-lee" in English