third interview with sears

i had my first interview the other day which went well, then i had the second interview today which went okay. she (the woman who is under the actual store manager) asked me in depth questions and i answered them to the best of my ability but i felt that i left her somewhat unsatisfied,although she was still courteous and smiled and nodded. she had to correct me on a few things which i thought was my biggest downfall. she also knew that i was clearly nervous. i have a third interview friday but i have the feeling that they are gonna give me an excuse as to why they can't hire me. however, the woman from the HR department did say that they have a 3-step hiring process and that i need my social and license for that but she also said that i'd need it today. do you think that this is a bad sign?

yea thats how I got hired 3 years ago is on the 3rd interview. They will also run a background check and drug test.