Martha giving in to Dale didn't feel all that farfetched to me. She seems to have at least been emotionally interested in Chip all season, despite his oblivious pursuit of Penelope. I think simulacrum sex with Dale speaks to her own sort of desperation and loneliness, and I appreciate that the episode avoided passing…

IIRC, Goodman's character talks about a "second wave" or something in the bunker. While the creatures here aren't the Cloverfield monster, no reason to believe they couldn't be its bosses or buddies buzzing down for infiltration and occupation after the rampant destruction.

In fact, he does reimburse the guy … with interest.