ARTHUR Season 10 Scavenger Hunt

As an inside-joke, every episode of Season 10 included the number 10 somewhere.

Happy Anniversary

 * The Ten Spot Diner
 * The jukebox costs a dime (10 cents) to operate

Flaw and Order

 * A 10 is on the man hole cover

Arthur Changes Gears

 * On The Ghost of Bicycles Never Ridden's shirt

Binky vs. Binky

 * Binky writes that he is 10 years old on the sign-up sheet

Operation D.W.

 * On Buster's transforming car/boat