It isn't only articles and individual sentences in them which are prone to mistakes in the English used in them. Headings of various kinds, notices, captions and advertisements are all capable of having errors in them. There is not so much text in an advertisement as an article, so the selection of samples of this kind of error has grown rather more slowly - but there is still the odd one almost every month.
The links here are to plain text documents containing a dozen faulty headings each - some obvious, some not so obvious! There is no particular order in this small collection.