The following are some interview tips from an interviewer in panel/group interview. The gist of the tips is, you have to be honest in interviews.
In the past 3 months, our group has an opening, so that I joined my teammates doing panel/group interviews. I realized 3 things from panel interview only:
1) If you answer very well, then your questions are becoming more and more difficult. People all see how you perform. They are curious to know how "great" you can be, they challenge you and they also expect you may not answer some questions very well because they don't the answers either. So don't be mad or down if you can't answer a couple of strange questions.
2) People care more whether you are intelligent and coachable. Most of the time, you are trained at work, so it's very important for your future teammates to find that you are a pleasant person, easy to work with, no toughness, no bluffing.
3) Be honest, as much as you can. We often pretend to mislead the interviewee to see if he/she can be honest. For example, we know something (call it A) cannot be produced at all, then we asked in a very casual tone "so producing A would be a piece of cake for you, huh?" If the person answer something like "absolutely", "I think so", "shouldn't be a problem", we would probably declined this candidate. If someone can double check on the question, think about it, ask questions if he does not understand, or tell us he has never seen/heard about it, that's what we expected to see.