Attack of the killer muffins! Attack of the killer muffins! They’ll beat you, bash you, Squish you, mash you Chew you up for brunch And finish you off for dinner or lunch Lunch, lunch Dinner or lunch, lunch, lunch Dinner or luuuuuunch
I think this is more of a Final Destination thing... it's a premonition about the infamous Baked Bads, although EATING all the poisoned muffins is PROBABLY not the best way of solving the problem, unless Derpy is immune to Muffin Poisoning.
...then there's an influenza outbreak and one by one the ponies who were spared the food poisoning begin to get sick in the same order they were meant to eat the muffins in... O_O
I definately hope that Derpy and the rest of the background ponies get into some crazy hijinks. I've heard that Derpy is going to be a 'Where's Waldo' type Easter egg in every episode of Season 2, but hopefully they do more than just have her sitting around in the background for the fans to find.