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"Well, how'd the old thing pan out this time, duke?"
He hadn't been up-town at all. (23.11, 23.12)
Huck's lies are spur of the moment, but the duke's are premeditated. We're thinking this is a major difference between conning someone, like the duke and king do, and just trying to get through one more day—like Huck.
I went to sleep, and Jim didn't call me when it was my turn. He often done that. (23.30)
So, we're reading along, chuckling at Huck's wacky antics, when Twain comes along and hits us in the gut with something like this: "He often done that." There's Jim, looking out for Huck just like a dad—or like a friend.