This thread was the ultimate face-palm moment. Are you serious?!?!? You are worried about having a 2-guard vs a 3-guard cut for your interview? Of course they will care if you show up with a rainbow spiked mohawk but this conversation is just ridiculous. Do you think the admission committee is going to meet and say "Well, I really liked him but you know, his hair was 3/32 of an inch too short." ?
RELAX! Go to your interview, take a deep breath and just be yourself. Pay attention to the crap that matters on your interview day like showing up on time and making sure that you are friendly to everyone.