- The title is a pun on the word,invisible
- In Timmy's school, there is a teacher that bears great resemblance with Albert Einstein.
- The opening title card is a reference to the classic book and subsequent film The Invisible Man.
- The kid in the Math class which was wearing glasses has a picture in Cosmo and Wanda's castle in the Hall of Infamy. This means that he could have been the last god child of Cosmo and Wanda before Timmy became their god child.
- This episode is available on the Season 2 box set as well as the bonus episode feature of the Jimmy Timmy Power Hour DVD.
- This episode was ranked #38 in the 100 Greatest Nicktoon Episodes countdown.
- Everytime Mr. Turner and Mrs. Turner drops off Timmy, they are inside the car.
- In every scene Mr and Mrs Turner are in, they are always in the car.
- Apparently Mr.Crocker keeps some fairy hunting gear in the janitor's closet.
- Apparently when it is the last day of school, Francis beats up every single male student in the school for his own pleasure.
- Elmer was recolored in this episode.
- Timmy doing mischievous stuff while he is invisible.
- When Francis stands up towards Timmy's desk, Mr. Crocker doesn't seem to mind that he is disturbing the class.
- In the beginning of the episode there was a metal fence on the front of the school like it was a private school. But in most episodes the metal fence is gone.
- After the close-up of Mrs. Turner talking inside the car in the school, you can see Cosmo and Wanda' mexican hats, but in the following scenes, they are nowhere to be seen.
- The man that joked about the clapping invisible hands has a weird cat-like face.
- When Timmy wishes his fairies looked like school kids, Cosmo's long sleeve is missing.