He proudly calls himself an "Erro-nort" and writes his aunt from "Mount Sinai where the Ark was", although the author attributes this error to his friend, in a work which features him "Abroad".  
He pokes holes in the stories of Jim Lane and Lem Beebe while uncovering the mystery of a twelve-thousand-dollar diamond heist during his time as a Detective. He proudly calls himself an "Erro-nort" and writes his aunt from "Mount Sinai where the Ark was", although the author attributes this error to his friend, in a work which features him "Abroad".  He accidentally claims to have once been engaged to Amy Lawrence while attempting to woo Becky Thatcher, and he poses as his brother Sid while helping the slave Jim escape.  For 10 points, identify this recurring character in Mark Twain works, a crafty friend of Huck Finn.
He pokes holes in the stories of Jim Lane and Lem Beebe while uncovering the mystery of a twelve-thousand-dollar diamond heist during his time as a Detective.
{Tom Sawyer} (accept either)