Arthur, who is an aardvark, has bunny slippers, and his best friend Buster, who is a bunny, has aardvark slippers.
Even though D.W. is a girl, all of the voice actors for D.W. have been boys.
It is implied through glimpses of the future that Arthur and Francine end up getting married after they grow up.
The first season cost more than $12 million to create.
Author Marc Brown recently revealed on the show that if you look carefully through the Arthur books, the names of his three kids can be seen hidden once in the illustrations.