If you don't take it seriously, you simply won't plan for it. Failure to plan properly and with due care is the single greatest pitfall into which interviewers fall and is at the heart of most other errors. To make it more specific, listed in the following sections are some very common mistakes that must be avoided at all costs.
In the hope of fixing things up faster, interviewers make blunders such as calling up without notice, being late, unapologetically cancelling the call, or inviting more interviewers than the candidate was informed about; this can make the whole experience unpleasant for the candidate.
Unless a recruiter analyzes the key characteristics of the requirement and clearly defines the traits to look for in a candidate, they are liable to make mistakes in the interview. If the interviewer isn't aware of the specific skills and attributes required, how can they ask the right questions...
