On his deathbed, Twain read and re-read Thomas Carlyle's rendition of The French Revolution.

Mark Twain did NOT write a book entitled Tom Sawyer's Buried Treasure. He DID write books entitled Tom Sawyer Abroad, Tom Sawyer: Detective, and The Tragedy of Pudd'nhead Wilson.

"It resembles us in some ways, and may be a relation. That is what she (Eve) thinks, but this is an error, in my judgment. The difference in size warrants the conclusion that it is a different and new kind of animal--a fish, perhaps, though when I put it in the water to see, it sank, and she plunged in and snatched it out before there was opportunity for the experiment to determine the matter."

Wilson stores a collection of fingerprints of the entire town and, in the end, uses this collection to solve a murder case.

Four of his books were published posthumously: Mark Twain's Autobiography, Mark Twain's Notebook, Letters from the Earth, and Queen Victoria's Jubilee.

The model for Huck Finn was Tom Blankenship, a boy four years older than Twain who he knew growing up in Hannibal. Twain would later write: "In Huckleberry Finn I have drawn Tom Blankenship exactly as he was. He was ignorant, unwashed, insufficiently fed; but he had as good a heart as ever any boy had."