The end of the zombie episode, everyone went home and didn't know the government almost killed tem. The end of this episode has barbwire, and these fancy old school sci-fi clothing that came out of no where. Just was too much and not funny enough.
Maybe I'll enjoy it more in rewatches.
Did we watch a different episode?
Because the end of this one had everything going back to normal. The Dean even announced on the intercom that everyone should probably just forget the last few days because of how embarrassing it was. Starburns even explains that his costume was rented...
As for the barbed wire, what's so weird there (for this show)? The painball episodes had the entire campus turned into a post-apocalyptic environment...