D.W. and Nadine's little moment was one of those that was done on a whim... really no rhyme or reason, just something I felt like drawing, but I think in a sense, it captures a childhood fantasy that kids probably at times wish their imaginary friends were, indeed, real.
As for Binky's dream... I don't know, I just got on a kick on Binky's little banana tirade from "How the Cookie Crumbles"... "I said banana, banana was MY idea, without ME there IS no banana!" I don't know, I guess maybe I thought it would be amusing that Binky goes to sleep at night and dreams of a world where everything is bananas, and he is one with the bananas.