This is the first appearance of Remy Buxaplenty since the Season 5 episode, Operation F.U.N, which was before the addition of Sparky, Foop, and even Poof.
Although Remy is on the episode, he being Juandissimo's godchild is not mentioned, and he's nowhere to be seen. Also, Timmy didn't seem to remember Remy, and it's look like they met in the first time in this episode.
This episode, as well as most of the other episodes is mentioned in the iTunes description for Season 9. It is mentioned as "Cosmo fueds with a gopher".
When Mr. and Mrs. Buxaplenty were introduced, they were only shown from the shoulders down like Mr. and Mrs. Turner in the Oh Yeah! Cartoons shorts. But for some reason starting from the birth of Poof and adoption of Sparky, their faces were shown and their character models changed. This is probably due to them not appearing in the show for so long, probably because they needed a character redesign.
This episode reveals that gophers are fairies' enemies.
Wanda (in Sparky's body) states she doesn't have to shave her legs. This a reference from The Fairly Odd Movie where it involves her legs that need to be shaven.