Leave
your cell phone or beeper on during the interview
Eat
(or chew gum!) during the interview, unless offered
food or drink by the interviewer
Get
casual. Don't slouch, take off your shoes, or prop your
feet on the interviewer's desk
Put
people (such as former bosses) down you might
discover that the person you're describing is the interviewer's
cousin or best friend!
Be
negative. No one wants to hire a downer who's always
criticizing and carping.
Wander
off onto tangents unrelated to the job, the organization,
or the interviewer
Repeat
yourself over and over or drill a particular point into
the ground; the interviewer probably heard it the first
two times you said it....
Pretend
to have skills or knowledge that you don't have, such
as mastery of a particular computer application. You
will get caught, whether in the interview or on the
job. Instead, point out what you do know (e.g. "I
haven't worked much with Access, but I am experienced
with Excel, and I'm sure I could learn quickly!)
Jump
the gun with questions about issues such as parking,
which will only matter if you are offered the job and
have to decide whether or not to accept.