Don't interrupt or ask questions at this point. You don't want to come across as overly aggressive. There will come a time to ask questions, and this is when you can demonstrate your range of knowledge about the company, its products and how your skills and experience fit their needs. We suggest writing down questions in advance and taking them with you. Enthusiasm is often the significant factor in hiring.
Interviewers respond to a candidate's enthusiasm about a job.
If there are negative things in your education or employment, be honest. Don't dwell on them and do try to put them in as positive a light as possible. Do not make negative comments about past employers. You do not want to appear to be a malcontent. End the interview on a positive note.