Walkup's Way Home  No No's that can cost you a job
Appearance
Wearing sunglasses throughout the interview
Dirty nails
Inappropriate attire for the position desired (you should be dressed for the position for which you are applying - when applicable)
Bad posture
Carelessly dressed, indicating a lack of care and concern
Your clothes is your packaging; it should not take away from the product. " Dressing professionally provides instant credibility and signals to clients, customers and colleagues that they're working with someone who takes the position seriously" (Diane Domeyer, executive director of Office Team)

Cell Phone
Interrupts the interview to take  shut off ringing cell phone or even to answer cell call

Communication
Answers questions with one word and absolutely no elaboration.
Uses crass language (sucks, Excuse me but I need to go pee) or even profanity.
Rambles on to complain (about former boss, former co-workers, family, and friends or about hours worked...)
Inability to express self and desires. Inability to sell himself.  Poor speech.
Saying you hate computers at at technological business or hat kids at a child care....
Nonverbal communication like slouching when sitting or standing say you have no confidence.

Dishonesty
Stating information that is different from what is on the application form, be it work history, reason for leaving, conviction record...

Enthusiasm
Lacking - shows no drive , no energy, not motivation, no desire, no promise to work hard.
Shows no particular enthusiasm or interest for the job being offered or for the business in particular.
Taps feet, bangs fingers, looks at watch as if ready to leave

Food
Bringing a snack or asking if there will be a break for a snack
Asking interviewer to hurry up because you're meeting someone for dinner

Personality
Timid, no self-confidence, inadequate, not poised

Preparedness
Lack of preparation for interview: lacking information regarding the position and company to which one is applying
Inadequate preparation for and skills for desired position

Salary
Unrealistic demands
More concerned with salary than with personal contributions to the position
Excessive concern with benefits

Silence
If the interviewer remains silent after you answer a question, don't get stressed and just ramble on to fill the void.  Rather, ask, "Is there anything else I can add to fill in on that point?" (Scarafile)

Thank Yous
Not sending a thank you can cost you a job per Rosemary Haefner, VP of Human Resources, career Builders.com. ("No Thank you could mean no job", Norwich Bulletin, October 19,2005 Page E1)

Timeliness
Arriving  on time, but rushed and frazzled at an interview
Arriving late at the interview