At the start of the episode, Darlene says her poem is homework for that coming weekend, but when Crystal later visits before Friday, she says Darlene's poem was already graded.
In the first clear shot of the back-wall behind the kitchen stove, there is a four foot or so gap between the wall and the stove, with two paintings perpendicular to the stove (on the same side-wall with the wall-cabinets and sink). This is normally how the kitchen set looks throughout most of the shows. In the second clear shot of the back-wall, it is now flush behind the stove with no gap, and the paintings are directly behind the stove.