Among the more subtle variations is the "l" in such words as talk and walk. I think most people don't say it at all, and pronounce the words as "tock" and "wok." Every once in a while, you'll hear someone voice just the slightest hint of it. But you'll never hear that "l" pronounced so clearly as when you're at the hardware store and some guy says to the employee "Yeah, I'm looking for some caulk."
Ah, caulk. Perhaps the funniest word in the juvenile/immature section of our lexicon. How can you not giggle at such classics as
"Damn. My caulk's not straight."and
"Wow, it's gonna take a lot of caulk to fill that huge crack!"and
"Eww, the caulk oozed all over my hands."
Sometimes, when you're just a little down and you need a good chuckle, the 5th grade stuff does the job quite nicely.
And for our topical musical link:
The Motels - Take The L