I think it's common for us engineers- we care about the problem, the details. So that's what we focus on. And that can actually help in interviews- we can rely on our knowledge to give us the confidence we need. That sort of quiet confidence shows the interviewer that you can do the job. The rest of it is just treating the interviewer how you would want to be treated- with respect and kindness. That shows that you can get along with him and the rest of the team. That's it! That's all they're looking for.