He was otherwise qualified, and the interviewer liked him, but he was not considered for the job. One of the most common mistakes candidates make is talking too much and overselling. Think before you respond. If you're unclear about something ask for clarification. People don't generally behave the same on the job as in an interview.
Many people are nervous in an interview and that affects their behavior.
A good interviewer will ask for examples, but if you're not asked, provide them. At the end of the interview, ask the interviewer to summarize your strengths and weaknesses. Tell the interviewer if you are interested. Ask what the next step is and when you can expect to hear back. Send your references.