Possiby the second time we see the attic as the attic, before it becomes Greg's room, I mean Marcia's. no wait it's Gregs!!!
The plot centers around the war of the sexes for the attic room!
Marcia wins out as Greg gives in, but it's Bobby and Peter's plain to make Marcia to give her "new"room up.
Classic is many ways, a well written and thought up epiosde.