Since the plague played out over time the nuclear subs would have been able to monitor the progress of the plague through public broadcasts and dispatches from their command authority. Doubtless the same would have happened with the SSBN fleets of the United States, Russia and any other navy operating such submarines.
Rescued from the Scrappy Heap: Sarah spends a majority of the first season being useless at best and outright villainous at worst. But during the second season, she begins to put more effort into acting like a better member of the group.
Iron Woobie: Kara loses her homeworld and gets stranded in an alien world with no supplies or clothes and her baby cousin to look after. She's hunted down by at least two different organizations. She doesn't know anything about that world, its people or their customs. And still she manages to survive and take care of her cousin. Nothing can keep her down permanently.
Unintentionally Sympathetic: The farmer guy Kara ran into wasn't what you'd consider nice or bright, but he wasn't a jerkass either. Yes, he shot at Kara... because he thought he was being assaulted by a trespasser or a wild animal. He was horrified when he saw he had fired at a child and he called the authorities right away. And still the story wants us to think the guy had it coming when Jason Connolly breaks his arm and swears to get him permanently watched, and killed and disappeared with no trace if he ever gets his hands on a gun.