This is the first appearance of Foop in the series.
The promotional name for this episode was "Poof vs. Foop!".
This episode reveals that Anti-fairies are born square, as opposed to Fairies that are born round.
This is the second time the word "Foop" appears on screen, the first time was Nega-Timmy, which was used whenever Timmy did the opposite of what his parents told him to do.
In this episode, it reveals that Anti-fairies just like fairies don't float when they sleep.
This episode reveals that the pregnant female Anti-fairies, just like pregnant male Fairies, can't float when the baby weighs too much.
Wanda's motherly instincts can sense a disturbance in the fairy force since they were acting up as soon as Foop was born.
Foop is shown to have been born later than Poof. This may be because Anti-fairy pregnancies may be longer, as everything that an Anti-fairy has is the opposite of their Fairies counterpart. It may also be because Poof was the result of a wish, whereas Foop was not wished for. It could also be that the show's crew simply forgot that Poof was meant to have an Anti-fairy counterpart.
This episode reveals that Anti-fairies created spiders, pink eye, paper cuts, and Crazy Cow Disease.
According to Anti-Cosmo in this episode, there is an Anti-fairy for every Fairy which is why he was questioning at the beginning of the episode why there is no Anti-fairy version of Poof.
This is the first and only appearance where Foop is with his parents.
Even though Fairly Odd Baby is considered the episode where Poof's gender is revealed, it isn't until this episode that his gender was actually confirmed. In Fairly Odd Baby it says that Poof is a boy because he likes water squirters, this is not a very accurate way of telling his gender. In this episode however, his opposite, Foop, is born and Foop talks with a male voice which is the true indicator of Poof's gender because if Foop is a boy, then so is Poof.
In this episode, Foop said Playdate of Doom, which is the name of another episode that features Poof and Foop.