This is the first episode where Steve plays his guitar.
This is the only episode that a piano is in the living room.
This is the first time that the Felt Friends move, talk, and interact with the main characters. The felt friends in this episode's names were Freddy and Fifi.
Steve said "Notebook" twice for the second clue.
It is also the first time Blue joins the Thinking Chair to see the letter she and Steve received.