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This was the only episode where Shovel skidoos.
The term "Clue collector" was previously used in Blue's ABCs.
When Steve says "Blue! Your ball!", his voice from Season One's Snack Time is used.
Gopher gets rid of the pawprint in this episode, which shows that he has a pawprint collection.
This sparked a fan theory stating that Gopher takes a picture of each clue and swipes its pawprint away.
When Shovel puts the clam shell in the box, you can hear the sound effect of Mailbox opening himself up.
The ball that Blue loses exactly resembles the Luxo Jr. Ball from Pixar.
This is the first episode where a blue crayon is used for drawing a clue.
The music for the ending credits is remixing the Blue's Clues Opening Theme.
This is the first episode to feature a jumping clue, followed by Dress Up Day and Animals in Our House?. However, the jumping clue in this episode is referred to bouncing while in the other two episodes, the jumping clue is referred to hopping.
This episode reveals why Steve always reaches under the thinking chair to out the letter there.
He has a letter collection and the box has yellow slot which is always facing forward so that Steve can put the later through and into his collection its also the first and only time that he does this with the box onscreen.
In the US version of the opening, the ball was present. But in the UK version, the ball was not present.