The dumb is starting to hurt. Where do we start? How about when Eve pokes a stick in the edge of the river, it only goes in a foot or two, and proclaims the river isn't deep. Because we all know rivers never get any deeper than their banks.
How about Heroin Boy? All that nervous twitch of a character has to do is explain to everyone what he found, what he did, and that's that. But no, let's keep it a secret, so Druggie can hold it over him. Possibly the dumbest sub-plot in the history of sub-plots.
The fully equipped plane horse lady built? Or the fort they found, that was wide open. Unless it's abandoned, isn't the idea of a fort to keep people out?
But my favorite has to be the massive government cover-up. Wouldn't the LA Times or WaPo or NYT or somebody be asking a few questions? Like WTF is at the bottom of it? Any show that depends on a massive government conspiracy as a plot point is doomed to failure.