It may well be that 'zoomed in' or 'cropped' is how it's been provided to Apple by the rights owner. It's unlikely that Apple will have done anything to it themselves.
I downloaded a documentary recently which contains quite a few minutes worth of 'black screen' at different points through out (it's actually the points for TV networks to cut in and show their adverts) lots of complaints went to Apple for cocking it up, but the reality was that that is how the rights owner provided the programme.
Apple cannot go in and re-edit the programme. They can ask for a new copy of course but some rights owners can be absolutely useless and don't usually care a great deal about these things.
The crop ratio on the screen is often a case in point more widely seen on DVD releases where the rights owner has basically bunged out any old version and not cared whether the image is in the correct ratio or not, it is unusual though for 'modern' programmes such as Dexter to have these 'cropping' issues but not unheard of.