Commonly, people have walked out of the interview panel, thinking that they have closed the deal. Aspiring candidates are ready to embark on a festive dinner carrying an element of hope in their eyes that's sure to accompany an imminent offer. However, they are waiting for time immemorial, and there's no call.
There is no offense on the part of the interviewee, but it's possibly either something he commented or anything he did: maybe without even realizing it. Job quest can be a long and horrific hill to climb, with a lot of morals and guidelines of the interviews suppressed then and there. It is, therefore, high time to revisit the potential interview errors committed most of the time that some people might be aware of, and a majority of others might have overlooked it. However, when searching for a new career, one should put an end to such pitfalls at all costs.