During the intro, D.W. gave several examples of Arthur being privileged because he is older.
Arthur: D.W., shh! We’re trying to watch the movie. And you’re not supposed to do the intro anyway. It’s my show.
D.W.: Wait! I’m not finished yet! Cut to title card. Older brothers.
Salesperson: Little girls are all very well and good, ma’am, but if you’re looking to save some money, we currently have a terrific sale on baby boys. In fact you can’t get a better deal than this one. Fifty percent off.
He shows a basket with baby Arthur, who immediately starts crying.
D.W.: I knew there was a reason they had Arthur first.
Ms. Morgan: You know, D.W. is so amazing, did you ever think of having another child?
Mrs. Read: Well, that’s just it. D.W. is so perfect, there doesn’t seem to be any point to having another one.
Nadine: What? Aren’t you happy?
D.W.: I guess I should be, but I feel bad for Arthur. If Mom and Dad don’t take him, who will?
D.W. has gotten lost in her dream. In the real world, she talks in her sleep.
D.W.: We’re lost! Help! Arthur stands in the door.
Arthur: D.W., are you okay?
D.W.: Arthur? Is that you? Oh good you’re not that broken baby from the baby store anymore.
Arthur: D.W., you know babies don’t come from stores. Remember when Kate was born? Mom and Dad explained it to you.
D.W.: Oh, right, so it was just a terrible nightmare. Arthur hands her a crazy bus toy and Mary Moo Cow.
Arthur: Here, will those make you feel better? I know I don’t have nightmares so much when I sleep with my Bionic Bunny. He tucks her in.
D.W.: Arthur, I’m glad you’re my older brother.
Arthur: Me too. Goodnight, D.W. He leaves.
A little later D.W. comes into Arthur’s room.
Arthur: Hm? She climbs into bed with him, holding the Mary Moo Cow doll.
D.W.: Goodnight, Arthur.