That is a bummer. I would call Gretsch and get them to make it right. You shouldn't have to wait another 4 months to get the drum you should have got in the first place. Those details are what separates good from great. With the competition out there these days, I can't believe that got by QC. If I was buying those drums, I would expect perfection.
Like Sterwart said, it happens to them all. I've had Yamaha's have to go back as well. I just made a DW order fro two add on toms for my pink champagne Collector kit...Fingers are crossed. (I'm sure they'll be fine)