Take a look at Humorous Reminders of Common Writing Mistakes. Note that they are introduced with the line "Here are a few things to keep in mind when you write an essay." I think some of these are appropriate in fiction, where you are often trying to create a mood of some sort or a particular type of voice for characters who may very well break all kinds of rules in their speech.
I don't know what a barbarism is (23). As far as 16, "Don't use contractions," is concerned, I think that's only true if you're a Klingon.
Found at Nathan Bransford's blog.