Tropes associated with The Oh Yeah Cartoons (Season 0)
Art Evolution: The characters look different and less refined than when the series proper premiered.
Brother Chuck: A very unusual example, Vicky had a brother in the first episode, but we only hear his voice and we never see him, and he is never mentioned again (or was replaced with Tootie).
Early-Installment Weirdness: For all characters, but most notably Cosmo and Wanda. Cosmo's voice is almost suave like a game show host and he is also somewhat more intelligent while Wanda is the scatterbrained one.
"The Big Problem!": Timmy wishes he was an adult, but ends up getting mistaken for a pervert by Vicky, forced to live on the street, and risks losing his fairy godparents.
"A Wish Too Far!"
"Dog's Day Afternoon"
"Dream Goat!": On a field trip to see Dimmsdale's mascot, Chompy the Goat, an accident makes Timmy out to be a hero while Vicky is accused of kidnapping Chompy (when Chompy was actually wished away by Timmy after seeing how unhappy he was), and things get complicated when Timmy begins wishing for horrible things in his sleep out of guilt over not telling the truth.
"The Same Game": After losing his ball to Depraved Dentist Dr. Bender (voiced by Gilbert Gottfried), Timmy (rather than wish for another ball) wishes everyone were the same, turning everyone into gray blobs and causing all the fairies of the world to return to Fairy World.
Tropes associate with season one.
Missing Episode: The Oh Yeah cartoons, except for one, were repackaged as three shorts episode, as there were so few episodes in season one. Around season four, they stopped airing these repackaged episodes when there were considerably more episodes that had been made.
The Other Darrin: For the repackaged Oh Yeah cartoons, Tara Strong redub Timmy's original voice actor, Mary Kay Bergman (who committed suicide before the show became a regular series). The DVDs of Fairly Oddparents do have the original "Oh, Yeah!" cartoon shorts where Mary Kay Bergman voices Timmy Turner rather than Tara Strong.
"Boys in the Band"
"A Mile in My Shoes"
"That Old Black Magic"
"The Boy Who Would Be Queen"
"Totally Spaced Out"
"The Switch Glitch"
"Mighty Mom and Dyno Dad"
"Fairy Fairy Quite Contrary"
"Nectar of the Odds"
"Hail to the Chief"
"Fool's Day Out"
"Information Stupor Highway"
Tropes Associated with season 2
Missing Episode: "Hail to the Chief" and "Twistory" aren't aired much (if at all) these days for reasons unknown. Some believe the shorts had particularly offensive jokes about the British and the United States Secret Service, while others believe the episodes weren't all that great and no one would miss them if they were gone.