The following is a best practice, proven technique for making better hiring decisions…
There are two parts to every interview: (1) gathering information and (2) evaluating that information, and, to the best of your ability, you need to keep them separate.
The tendency is for one “bad” answer to negatively skew the interviewer’s perception of all subsequent answers and the reverse is also true. One “perfect” answer can make the interviewer overlook faults or inconsistencies in later answers.
The answers to interview questions should stand alone and not be evaluated until the interview is complete.