This is the first time the Thinking Chair is the answer to Blue's Clues. It's the second time it was involved in Blue's Clues outside of sitting in it to think, the first being when it was the second Blue's Clue in Inventions. It was also part of the drawing of the Handy-Dandy Notebook in the aforementioned episode, as well as Blue's Big Musical.
This is the fifth episode where a chair was a clue. The first two being Mailbox’s Birthday, What Story Does Blue Want to Play?, Blue’s Big Treasure Hunt, Blue's Big Musical and Inventions.
If one agrees with this, According to the end of the “Meet Joe” special in the original series (where Joe became the new host of the original series in 2002), there were some pictures showing different scenes from then-Upcoming episodes. And there was a photo where Joe and Blue were playing and hide and seek, and even shows Joe hiding behind a bush, while Blue was looking for him, much like what happened in this episode when Josh and Blue played at the beginning of this episode. It’s possible that this episode was gonna be in the original series during the Joe era, but never made it into production till now. It might not be true, but it is possible.