1) I haven't heard of it, doesn't mean it doesn't happen though. I've only heard of "officially" speaking with adcom members about your application if you are applying early: my premed advisor said you should meet with the dean of admissions if you're considering it, and unless they virtually guarantee your acceptance, don't apply early.
2) I would say don't try to read too much into it other than some (hopefully) solid advice about your application. One thing many people learn on the interview trail is that, as much as one or two interviewers/adcom members may like you, the decision still lies with the entire adcom, one that's trying to create a class, not just select individuals in isolation.
In any case, it can only be a good thing. Try and get some useful information, but don't put too much stock in what any one person says (including me...).