Chloe says that multiple satellites were active during Dark Thursday, but we learned from Orlando Block, in "Sneeze", that there was only one satellite active during Dark Thursday.
Permanent vegetative state means all high brain functions that control consciousness have irreversibly ceased, while the brain stem, which controls metabolism and essential function remains intact. As a result, once a person is permanent vegetative, they will never recover.
When Clark is moving hay bales in the closing scene, the "hay" peels back to show obvious cardboard boxes underneath.