If you look on the right side of the comic, you’ll see a rug that is only half in frame. The commenter is discussing how Gary Larson (the cartoonist) has explained that he struggles with drawing that style of rug (and in this instance, it isn’t even fully drawn, probably on purpose). The commenter then explained that, because of the difficulty, Gary Larson probably just said “good enough” when drawing the downstairs apartment.