This is the 1st time the viewers interact with the video letter.
They would interact with the video letter again in "Joe's Clues".
The kids in the video letter said Hi to both Steve and Blue even though Blue wasn't anywhere near the Thinking Chair during that time.
After Steve draws the 3rd clue on his notebook, Blue's paw print left on-screen, but the size and color changed. However, this was fixed in the Portuguese version.
The thump noise heard when Steve sits in the Thinking Chair was played late.
The music for the "Go Back" song (specifically the version that played when everyone was looking for Blue's backpack) also played as a background music for several PC games like Blue's 123 Time Activities.