I just realized something while watching "Sue Ellen Chickens Out" today. It takes place during the later autumn months, since there's fall foliage and piles of leaves everywhere.

But "Sue Ellen Moves In" took place in the middle of winter time. It also took place while they are in the third grade, as Mr. Ratburn is present towards the end.

So would that mean the kids were in the fourth grade during "Sue Ellen Chickens Out"?