Here are a dozen mistakes to avoid in order to put the odds in your favor:

Dress inappropriately

Are you in charge of the job? If you're the only one in the room not wearing a tie, that's a terrible start.

Arrive late

Unforgivable. And since there were likely other interviews before and after yours, don't expect recruiters to go out of their way to accommodate you.

Answer your cell phone

By showing that your call is more important than the current interview, the message you send to the recruiter is that your time is more valuable than theirs. Do you really think this is the case?

Forget the name of the person conducting the interview

That says a lot about your ability to fit into the team.

Know nothing about the company that hires you

Knowing what you are talking about is imperative. There is nothing better to do than doing a little research on the company.

Appear arrogant

Being sure of yourself is one thing. Making sure you get the job is a whole different thing.

Cut the recruiter's word

Basic politeness requires that you listen to your future employer. He's the one conducting the interview. Not you.
Not paying enough attention

Listening also means understanding the meaning of the questions you are asked. If the recruiter has to ask you the same question a second time, they may well tell themselves that you won't understand their instructions when the time comes.

Speaking badly about your former employer

If you left your former employer on a bad note, keep that to yourself. You have been called in to have new blood in the company and not new conflicts.

Appear indifferent

If the position interests you, let it be known! At the end of the interview, you will be sure to be asked if you have any questions. The answer is yes. By asking questions about certain aspects of the job or business, you demonstrate your interest in being part of the team.

This is the best way to end an interview!