An article about authorship attribution led me to this nice site on Common Errors in English Usage. The site is for a book with that title, but the author Paul Brians has organized all the errors into a hypertext here. For example, here is the entry on why you shouldn’t use enjoy to.
What does this have to do with authorship attribution? In a paper on Authorship Identification on the Large Scale the authors try using common errors as feature to discriminate potential authors.