In one scene, the Impala drives through the countryside with a farm in the background and a sign painted on the side of the barn that reads "Michigan's Finest Livestock". This episode is set in Iowa.
Sam and Dean visit the town of Beaverdale, Iowa. In fact there is no town called Beaverdale in Iowa. It is on the other hand a neighborhood in the city of Des Moines, Iowa. There is also no high school named Beaverdale High in Iowa.