+1 .. Plus a lot of interviewing skills are just common people skills that you can screw up without thinking about it. Just keep interviewing and pay attention and review things afterwards. Simple things can make a difference. I had a job that I really hated and tended to bad-talk the company in interviews. I went for months without an offer as it, not surprisingly, turns out that people don't respond well to this. Once I stopped doing it I had 2 offers within a few weeks.