'Superstore' EP Justin Spitzer on Jonah and Amy, Dina and Garrett, and... a Tornado?! (SPOILERS)

Warning: Plot details for May 4’s Season 2 finale of “Superstore” follow. Do not read unless you have seen Thursday night’s finale episode. NBC’s sophomore comedy “Superstore” finished its second season with a bang tonight -- or more exactly, a cyclone. A tornado ripped through Cloud 9 -- opening up a gaping hole in the roof...