11. Running late
Every boss wants an employee who is dependable and a good representative of the company. Someone who's tardy to an interview is neither.

12. Dressing for the wrong job
Appearances matter in an interview, and you should dress for what's appropriate in your field. Find out what the dress code is before you show up so you fit in with the company culture. Wearing a suit when you're told jeans are the norm can make you seem stuffy; wearing shorts and sandals when everyone else is wearing suits makes you look oblivious. You're better off erring on the side of too professional than too casual.

13. Griping about past employers
Keep in mind that you're not guaranteed to be with any company forever. When you talk trash about your last company, your interviewer's thinking, "What are you going to say about me once you leave?"

14. Not asking questions
One quintessential interview question is, "Do you have any questions for me?" Sitting there silently suggests you're not invested in the job. When you go to a restaurant, you probably have a few questions for the waiter. Shouldn't you be just as curious about a new job?

15. Not doing your research
Research for a new job involves two important subjects: the position and the company. Find out as much about the position as you can so you can decide if you even want it and so you can position yourself as the best fit for the job.

Knowing all you can about the company will help you decide if you like its direction and share its ideals. Plus, when it comes to the all-important "Do you have any questions for us?" portion of the interview (see above), you have plenty of material to cover.

16. Thinking the interview starts and ends in a meeting room
The formal interview occurs when you shake hands with the interviewer and ends when you leave the room. The full process begins when you're called or e-mailed to come in for an interview and it continues every time you converse with someone at the company. Were you rude to the recruiter or the receptionist? You never know what gets reported to the hiring manager.

17. Talking about money too soon
As eager as you are to land the job and cash your first paycheck, let the employer mention salary first. Broaching the subject first implies you're more eager about money than about doing a good job.

18. Acting cocky
You never want to beg for a job, but you should act as if you care about it. If your confidence level spills over into arrogance, you'll guarantee no employer will want to work with you.

19. Being so honest you're rude
Not every job will turn into a lifelong career, and you might have no intention of staying at the company more than a year or two when you interview. Still, hiring managers don't want to hear that you're taking this job just to pass time until you find a real job that you care about. You don't need to commit yourself to the company for a decade, but don't make yourself sound like a flight risk, either.

20. Forgetting your manners
Common courtesy can get you far, and in a job hunt you'd like to get as far as possible. After an interview, send a thank-you note (via e-mail or regular mail) to show your gratitude to the interviewer for taking the time to meet with you. This will leave him or her with a good impression of you.

21. Stalking the hiring manager
If the interviewer gives you a deadline for hearing back from him or her, go ahead and call to see if a decision has been made. Do not call, e-mail and visit every day until you finally get a response -- which will probably be, "You definitely did not get the job."

22. Not keeping track of your applications
Because a job hunt can be lengthy, you should have a running list of where you've applied and whether or not you've heard back. Although you don't think you'll forget where you applied, after a dozen applications your memory can get fuzzy. Sending multiple applications to the same employer says, "I'm either disorganized or I'm just sending out bulk applications."

23. Not learning from mistakes
You're bound to make a mistake here and there during an interview. If a question trips you up, think about what went wrong and prepare for it the next time. Don't forget mistakes from your past, either. Look back at jobs you hated and try to avoid landing one of those jobs again.

24. Assuming you got the job
Don't ever assume you have the job until you actually hear the hiring manager say, "You got the job." Several factors can complicate whether or not you get hired, so don't halt your job search until you receive an offer. Keep searching for work because the deal might fall through at the last minute or you might find an even better job.