No, they haven't switched bodies! That would be absolutely ridiculous. They've simply transformed so that they APPEAR to have switched bodies.
I believe the design of that extra in line for popcorn is based on someone I talked to online at the time. It's possible they've made other appearances, but I'm not sure. It wouldn't surprise me.
Whoever is in front of the line isn't based on anyone, and they should really consider a comb.
Speaking of popcorn, don't get me started on current popcorn sizes at movies. I mean, yes, one may want a lot of popcorn for the price they're paying, but a modern medium is what would have been a large back when I was a kid, and a modern large wouldn't be anything but the mad dream of a popcorn enthusiast.
The first time I had a modern large popcorn was back in college when I jokingly asked for "the largest popcorn they had", and they unleashed that monstrosity upon me. I don't think it was even called a large at the time. It had some special classification beyond that of large, almost as though it were intended to provide additional gravitas to its enormousness. Nowadays? It's just a large popcorn.
I love Tedd's hair in the last panel.
Commentary added for December 31, 2014