Here's some things to ask that I picked up on the interview trail that could be of help, to ask either residents or attendings:
Are there any off site rotations, and where are they? If they are provided solely for getting the numbers, do residents get those required cases in the time allotted or do they sometimes have to take multiple away months to do so? You may see this in larger cities where there is one central childrens hospital for example, not necessarily a bad thing at all. But if you're going far and away to get your peds, OB and hearts then look closely at those experiences and make sure that they're up to par.
When does a typical resident complete all of their ACGME required "numbers"? End of CA-2, or where in CA-3.
Where have past residents gone after graduation; ie fellowships and where, private practices and where?
How and when are difficult airway techniques taught and practiced? Large variation in how programs do this. No right or wrong way, but make sure something is in place.
Same as above for regional, the ACGME only requires 'significant' exposure in fiberoptic intubations as well as regional nerve blocks. This can vary a lot program to program, but some system of getting residents the exposure to do the basic blocks should be in place.
Who makes up the schedule and case assignments? This is, after all, how you're going to learn anesthesia.
Save all of the parking, free meal, insurance, etc. type questions for the residents as they shouldn't make or break your decision.