Everything from what to wear to the interview, to the way you behave before, during, and after your interview can affect if you get the job.
In an article written for Monster College, I discuss Seven Things That Can Ruin a Job Interview. Even with the best intentions, it is easy to make one of these mistakes.
The article Showcase the Right Attributes to Land the Job discusses how to shine beyond the information on your resume. Often employers are presented with several candidates with the same qualifications. It is important to use your personal qualities to sway the hiring manager's decision.
Making the best possible impression at a job interview, won't guarantee you get the job, but it will definitely help your chances.