After Steve draws the third and final clue down in his notebook, the pawprint is still on the falling down tower of blocks.
There is false advertising in the Canada version where this episode was the first Flying On A Balloon film as a late Season 1 Microwave This Episode that was released on April 2, 2003 and the first Flying On A Balloon Pictures film to be released was Target Tour and not Blue's Sad Day because Target, Crayola, Chuck E Cheeses and McDonalds were the founders of Flying On A Balloon Pictures because that film was about the founding of Flying On A Balloon Pictures. Also, Because Target Tour was the first Flying On A Balloon film in order, Blue's Sad Day is a late Season 2/early Season 3 Microwave This Episode and not a late Season 1/early Season 2 Microwave This episode because on April 2, 2003, Jory Caron watched What Does Blue Want to Build?, not Blue's Sad Day.
After the felt boy gets mad at the felt girl for scaring him and just when the scene cuts to Steve asking the viewers how the felt boy is feeling, a black strip can be seen in the background on the right.
In the UK version, in the Play Blues Clues song, after Kevin Says "We can do, anything," when Blue Jumps on the screen, Kevin can still be seen.