Could second look hurt my chances?

I'm laughing because this self-doubt has crossed my mind also. But I really don't think you should let that hold you back from 2cd look if you really feel you need it to make your decision. That small chance of doing something stupid is ALWAYS there, so don't let it hinder your choices in life.

 

Sure you can screw it up -- spill coffee on the program director, accidentally knock over something valuable, inadvertently ogle someone's spouse/child, have a fender bender with the specialty chairman in the parking lot, say something remarkably stupid, etc. But odds are that if you didn't do that the first look, you'll be okay at the second.