Well, if you were an bughole the entire time you were in P. school, you might want to purchase a 'nice guy/gal' mask before the stores run out. This time of the year, they are in pretty high demand.
If you were not a bughole then just be yourself and know that if that isn't good enough for the programs you are interested in... that you could probably get into medical school or do another degree. lol.
Seriously, if any program is that hopped up on themselves where they can't spot phonies or expects something that you can't or won't be, then you probably don't want to go there anyway. IMO water finds its own level.
Academically, speaking start thinking the basics asap as far as ddx, dx, special tx plan that best fits the patient as well as having a solid foundations regarding your education.
I simply love all the old residency Q sheets that get passed around by some not so capable students, for some of the programs, which have old residency interview Q's. I mean if anyone has 20 years of Q's, honestly, do some of these programs really think that it means jack? Again those are places I wouldn't want to be in the first place b/c I'd question the real abilities/potential of the residents etc and basing ones intelligence and ability on old TQ's and old power point presentations has really grown quite old for me.