This is the only episode so far to feature Tootie in the title card.
Timmy is implied to be older than Tootie when he remarks that she has a bed time.(9:00)
This is the second time Timmy kisses Tootie.
Tootie remembered Timmy called himself her boyfriend even though he wished not too, likely since Da Rules say magic cannot interfere with true love. However, this little bit of character development has since not been referenced again. A reference to this exists in the early draft to the episode "Oh, Brother!", although it was removed in the final cut. But, in A Fairly Odd Movie: Grow Up, Timmy Turner! he mentions kissing Tootie against his will, and that he hated it.
Ironically, while Timmy's first wishes were revenge on Vicky, Tootie did not try to harm Vicky at all despite her ruining Tootie's party in the first place.
Tootie, in contrast to Timmy, seems too appreciative of what Cosmo and Wanda do for her, and wants to thank them by telling everyone at her party how great they are. This is a major violation of Da Rules and would have resulted in Cosmo and Wanda having to "go away forever". It may also be the reason why she never gets a fairy despite living with Vicky if her future in "A Fairly Odd Movie: Grow Up, Timmy Turner!" is any hint.
According to Crocker in this episode, buttercream icing isn't made from scratch anymore.
Vicky only appears at the beginning.
When Cosmo and Wanda introduced themselves to Tootie, their leitmotif music from the Oh Yeah! Cartoons shorts and Season 1 can be heard.
Igor Sikorsky - While being hooked by a helicopter, Crocker mentions Igor Sikorsky; as he refers to the helicopter as an infernal wingless flying machine. The latter is in fact the inventor of the mass-produced helicopter.
If Tootie is twice as miserable as Timmy, then she should have already gotten fairies long before Timmy wished for it. Even though Tootie seems unable to keep a secret, it may be because she didn't know Da Rules and she was just trying to be polite, and it doesn't explain why she never received one without Timmy's help in the first place, as children who are unable to keep secrets seem to get fairies all the time (more so than those that can) according to "Abra-Catastrophe!"
Cosmo and Wanda should have told Tootie about Da Rules. They could have easily used magic to stop Tootie from revealing them, like they do whenever Timmy nearly breaks Da Rules.
In one scene, when Timmy is running with Tootie while holding her hand, Tootie is bigger than Timmy.
Cosmo and Wanda have to go away "forever" when they are discovered by people, but they were already discovered and taken away from Mr. Crocker in his childhood according to "The Secret Origin of Denzel Crocker!". However, Timmy was likely just speaking hyperbolically.
After Crocker does his "FAIRY GODPARENTS!!" spasm on top of the cake he tears his ballet costume but in the next scenes he is wearing his normal clothes
When Timmy giving Tootie a birthday gift, Timmy's have a bracelet on her arm. After that, Timmy's bracelet is gone.
When Timmy lands, he says "A boyfriend!" yet in his next quote, "Uhh.. yes, a boyfriend!" he acts like someone else said it.
My interpretation of that was always that Timmy was shocked and embarrassed by what he just said, like, "I said that!".
Timmy rejecting Tootie's birthday party invitations during flashbacks ("guilt trip") shown by Cosmo.
Mentioning the Magic of Guilt with Cosmo responding "coma"
Timmy holding Tootie's hand with the latter being excited
Tootie being interrupted from revealing that she has Fairy Godparents