Bleep contains a couple of past references to things breaking on the show, during the teaser sequence when Arthur fantasizes D.W. telling Mom that Arthur accidentally broke her glass bird, as in Arthur's Perfect Christmas, and later when D.W. says the swear to Arthur, causing him to drop his model Bell X-1 rocket plane he was working on, and the plane breaks again, just as it did in Arthur's Big Hit (except it broke for a different reason, and Arthur was not as concerned about his plane being smashed here.)
While D.W. is spying on the neighbors, you can tell when her neighbor said the curse word because if you look closely inside the neighbor's window, you can see them suddenly get that surprised look on their faces.
Why are Koko and Taj, two famous blues singers, hanging out at the home of Sarah McGrady, a lowly cafeteria employee?
When D.W. is spying on the neighbors, the kid that she tricked's dad's hair turns from dark brown to light brown.
At the end of "Flea", it seems that Pal and Kate can understand what Mrs. Read is saying, although human speech has always been gibberish to them before.
How can DW claim she gave up her crib for her little sister? In "Arthur's Baby/DW's Baby", she was all excited about her parents moving the crib back into her room for the new baby, and she already has her "big girl bed" for a long time now.
What was Pal doing in the house? In "Arthur's Pet Business", it is revealed he didn't come back then!
In this episode of Arthur, Buster's dad, Bo, is shown to have a gray, fur-covered face that looks more rabbit-like. But, in the actual show of Postcards from Buster, Bo is shown to have a more humanoid face that is white and has brown hair between his rabbit ears as well.
The sidewalk artist that Buster meets, Dr. De La Vega, is actually real life street artist James De La Vega.
Why would the Unicornucopia promoters list a one-star review in their advertisement?
Buster's dad should have had enough intelligence to not park in front of a sign that said, "Don't even think of parking here". For that matter, he should have been wise enough to not attempt to park in New York City at all.
In "Fernkenstein's Monster" there is a scene where Fern is swinging on a swing and at one point the camera cuts to side thought of her and the front of her shirt has turned blue instead of the purple color it normally is.
In French, "zut" means "Darn it!" or "D*** it!"
In 'Thanks a Lot, Binky', in the scene where Rattles is in the hospital wearing a body-cast, he has bear ears (like Brain's). Later on, in 'D.W., Dancing Queen', when Rattles is dancing in the show, he has dog ears (kind of like Fern's, but smaller).