It's a staircase analogy thing. Or ladder I guess, if you prefer that to
LizzyM's version. I don't think an interview means your 3.5 has been overlooked.
I think it means they want to meet you and talk to you just in case you're actually worth overlooking the 3.5 for. I stand by what I said before, you better be really ****ing special if you're going to get into Harvard with a GPA a quarter point deep into the bottom 10%. It isn't
impossible, but then again neither is getting into a US MD school with a bottom decile MCAT. Doesn't mean "a 485 won't keep you out of MD school" becomes accurate !