Periwinkle is ready for his first day of school. Once he gets there, he finds that he thinks that school is lots of fun. He takes part in activities such as circle time and painting time and even gets to feed Giggles, the class bunny. When it's time to go home, he likes school so much that he wants to play it as a game at home. And since the third clue was found on the way home, Joe figured out Blue's Clues and when playing school, they play the answer to Blue's Clues.
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According to the original website of Elizabeth Holder, one working title for this episode was Peri's First Day of School. This episode appears in some online listings as Periwinkle's First Day of School.
Before this episode was ever released, a book was published titled "Blue Goes to School".
Near the end of the movie Daddy Day Care, Becca (one of the kids in the movie) can be seen reading this book.
This is the only appearance of Friends and Circle as talking clues.
Periwinkle refers to Purple Kangaroo to her in this episode.
There was no skidoo or Mailtime segment on this episode.
Blue has skidooed into her school in past episodes like "Blue's Sad Day" and"Shy" as well as a later episode, which sort of contradicts the idea that she needs to go to an actual physical building to go to school.