Every precaution you took to ensure the interview goes well demonstrates how vital it is for people to make a good first impression on those who will have an impact on their life. If you didn't impress the interviewers, you would't get your dream job. If you don't impress the girl, you won't get a second date. First impressions are an innate human concern. People naturally judge others based on the first glimpse they get of them.
In Meredith Willson's, The Music Man, Professor Harold Hill seems to make an excellent first impression on every citizen in River City, Iowa except the one person he needs on his side: the librarian, Marian Paroo. Promising to create and conduct a boys' band, Hill cons the incognizant parents in the town into giving him money for band equipment, though the "professor" knows nothing about music. As Hill continues to scam the town and rob them of their money, Marian is one of the only people to see his deception. She has the resources and intelligence to expose Hill, so the professor must try to win her over. This proves to be no easy task.
Marian is reluctant to believe anything Hill says and refuses to go out with him, though his persistence is unforgiving. Because Harold Hill did not make a good first impression with Marian, her permanent image of him is a lousy one. Throughout the whole first act, nothing Hill does impresses Marian; she actually begins to despise him more. However, just as Marian is about to confront the mayor about Hill's real intentions with River City, the professor is able to change his image in Marian's mind.
When Hill gives Marian's younger brother, Winthrop, a new cornet, Winthrop's excitement is so boundless that he becomes happy for the first time since his father died. Marian sees how Hill has positively impacted her brother's life, and she completely changes her stance on the man. Now, Marian is able to forget the harm he is doing to River City and focus only on Hill's admirable qualities. This illustrates that while first impressions are crucial, people can change their opinions over time if they realize their first image was not representative of the new person. Impressions can be wrong.
By the end of act two, Marian and Harold fall in love (what else do you expect, its a musical). Despite the horrible first impression he made on Marian, Hill is able to persuade the librarian over time that he actually is a nice guy. So, while you probably should be worried about the success of your next interview, bad first impressions aren't always the end of the world.