Pay attention to people with bleeding orifices and other life lessons.
Don't Judge a Book By Its Cover
Gordon McClintock, American hero...and Indogene sleeper agent. The town was ready to embrace the returning hero, but perhaps, if they'd looked deeper, they'd have seen the alien underneath. Then again...
When You Least Expect It...
The entire town spent the episode obsessed with one of its new arrivals - McClintock - when it should have been paying attention to another - the reporter from the West Coast who just happened to be carrying a viral hemorrhagic fever. Best not to get blinded by the light.
No Fate But What We Make
So, McClintock was an Indogene plant...but as Rafe pointed out, he didn't have to let that define him. He had the choice to become the man he wanted to be. And so do we all.
Bureaucracy: It Still Stinks
You'd think that, once the Earth was overrun by alien terraforming, things like governmental niggling might have gone the way of the dodo. Think again. As Connor's E-Rep incursion shows us, people in power will always make things harder for those on the fringes who just want to get things done.
The Love That Dare Not Speak Its Name
Kenya's cavalier attitude about her affair with Stahma could have been both their undoing, if the Casti miaden hadn't put the kibosh on that approach right quick. As Datak's wife knows, sometimes subtlety is the way to go.