Everyone's heard about the 1631 King James Bible which misses the word "not" out of the seventh commandment which then read "Thou shalt commit adultery". A couple of others:

A biography of George Eliot (the pen name of Mary Anne Evans) once referred to the author throughout as "He".

The first edition of James Joyce' "Ulysses" contains over 5,000 typographical errors.

And I remember the "Lincolnshire Echo" once carrying a job ad for a "Scretary" explaining that "good typing skills" were required.

To slightly misquote a notice in our old University common room "Don't just submit- READ!"

A student of TMWBTB once wrote:

"always spellcheck your wok to avoid mistakes".

(I do, regularly, and have found many instances of noddles, star-fry and black bin source.)

In the late 1960's, a newspaper columnist wrote, 'The importance of this matter cannot be minimised.' I used this (with permission) as the frontspiece quotation for my Master's Thesis (Another's response - frontspiece, frontispiece or cod piece?)