Inside jokes

In many Arthur productions and books, inside jokes have been seen or heard. These can include characters referencing to crew members or other inside information.

That's a Baby Show!

 * One of the names in the credits for Mary Moo Cow seen in the episode is Tolon Brown, Marc Brown's son.
 * Another name in the credits for Mary Moo Cow is Alex Tankushev, which is probably a reference to storyboard artist Ivan Tankushev.

Elwood City Turns 100!

 * Marc Brown is on the guest list and is seen sitting in the celebrity row.
 * Jeremy O'Neill, an Arthur storyboard artist, was on the guest list

Home Sweet Home

 * Sanjeev and Irwin mention a teacher at their school named Mr. Fallon, referencing former writer on the show Joe Fallon.
 * Sanjeev and Irwin also mention a teacher at their school named Mr. Scarborough, referencing writer Ken Scarborough.

The Wheel Deal

 * Sam Scarborough gets his name in this episode. The name is probably a reference to writer Ken Scarborough.

Trouble with Trophies

 * In Arthur's fantasy in the intro, Arthur is awarded the Marc Brown Certificate of Existence, referencing the fact that Marc Brown created Arthur.

Season 16

 * In The Last Tough Customer, when Mrs. Bickles walks next to the ice cream shop, the car on the road's license plate is 9 Story. 9 Story Media Group started producing Arthur during that season.

Arthur, It's Only Rock 'n' Roll

 * D.W. dismisses liking Crazy Bus entirely, saying that it is for little kids. This is a reference to the writer and performer of the song, Joe Fallon, leaving the show.

Arthur Books

 * In the Arthur Adventure series, Marc Brown hid the names of his children, Tolon, Tucker, and Eliza, in illustrations on each page.