Wow. This was brilliantly written from beginning to end. One of the most enjoyable books I've read in ages. Mark Twain is a true master of the English language and the craft of storytelling. The characters were consistently written and amusing to watch. He can wring humor from small turns of phrase and loads his writing with irony. Some of the funniest scenes were detailed descriptions of mundane things that every reader can relate to.
What an inspiration! I look at my own writing and I see where it's really lacking -- description. I tend to skip describing things because it slows the action. Twain can describe things down to the smallest detail and keep it interesting.
On to Huck Finn...