Arriving Late Most often when people arrive late, they do not get hired. It's okay to arrive a little early, but if you show up too early you'll present yourself as eager. Dressing Wrong Don't show up to a formal interview wearing jeans and a T-shirt. Don't leave any buttons undone, or dress sloppy. Make sure your clothes look well-pressed and clean.
Most employers prefer that their employees are nonsmokers.
Drinking If you are having a lunch interview, make sure that you stick to mineral water or club soda. Chewing Gum Chewing gum is very inappropriate during an interview. Bringing Along a Friend or Relative Don't present yourself in an unsure manner by coming to your interview with someone else. You need to show your interviewer that you are a mature, responsible adult. Not Doing All Your Homework Make sure you know the company's background before you go to your interview.