Do you have an opinion on hiring mistakes?

Angela Rogers, a freelance journalist, has got in touch with me to ask for some help researching an article she's writing for the IT Manager's Journal.  The topic is "So You Think Hiring Wisely Won’t Make A Difference, You Only Want The Job Get Done".

She'd specifically like answers to the following questions:

1.  What are the most common mistakes made by companies or hiring consultants while hiring individuals?
2.   How to avoid the mistakes while hiring?
3.   Any expert comments on hiring in relation to the title of the article.

If you think you can help you can contact her on wisewhirls@yahoo.com.