Extreme Makeover - When Cosmo made Timmy's wish, a poof cloud reads "Extreme Makeover Poof!", Then, when Wanda unwished Timmy's wish the poof cloud reads "Extreme Un-Makeover Poof!" which makes a reference to the show.
Air Force - The name of the destroying hair force "Hair Force" is a pun on the "Air Force".
When the fishbowl breaks, the castle suddenly disappears.
When Timmy's hair falls on Dimmsdale, Timmy had some hair on his head, but in the scene where he pops out the hair, he is bald.
At the scene where Timmy, Cosmo, Wanda, and Poof are in the bathroom, Poof looks smaller in size than he normally does.
In the scene at Baby Barbers, the barber reads Chapter 1 of a fairy baby haircut book. However, the page he is on is halfway through the book, despite it would be around page 7 (2-7 being the title again, etc.)
When Mr. Turner appears from the garage, the garage appears standalone, with the sky and no house visible to the right, as the sky on the left has the same color as the right-hand side of the garage.