The Adventures of Mark Twain
You may watch the trailer below for the 1944 film, The Adventures of Mark Twain, which you may want to watch in its entirety.
I have not yet watched the entire animated film, The Adventures of Mark Twain, but what I have seen seemed to fit Twain’s personality. The creators of the adventure have cobbled together characters and events from Twain’s stories to create something new.
Here is a trailer for this 1985 Claymation film.