It's not a mistake - it's inverted word order.
You must invert after certain phrases, like
not only, never, at no time.
You can also invert for style reasons, as you would if you
put the location first.
A lone pine tree stood on a distant hill.
On a distant hill stood a lone pine tree.
{not a teacher}
EDIT: Ah, I just found this site. It reminded me that you don't invert when it's a personal pronoun and a location. Down the steps ran the puppy, but Down the steps she ran.
http://www.annies-annex.com/inverted_word_order.htm