Plot hole: In the episode "Class Clown" when Timmy wishes he was the funniest kid in the world and everything he says is freakin' hilarious, then how come when Timmy says "Tip your waitress." to Cosmo and Wanda nobody laughs, but everything else he says is funny.

Continuity: 4-11: Truth or Cosmoquences / Beach Bummed: When we first see Trixie and Timmy inside Timmy's large sand castle (or whatever it was), they were sitting at the ends of a long table. But when Francis destroys the castle, Trixie and Timmy are way closer together.

Continuity: Episode 66-5 "Hassle In The Castle/Remy Rides Again": In the final scene, notice the house across the street furthest to the left; first time it is shown there is a large window with light coming through. The last time we see the same shot, however, it is a totally different house.

Plot hole: Season 6, Episode 5 (overall episode 73) "The Good Ol' Days / Future Lost": In the episode "Future Lost", when Mark is hugged by several students at school, wouldn't he possibly freak out, since he is a Yugopotamian who doesn't like being hugged?

Revealing: In the episode Hassle In The Castle, in the hall of Infamy the name plates are either scribbles or they're just blank.

Continuity: In the Fairly Oddparents episode "Power Pals", when one of the Power Pals chucks a crystal into a drain to create "The Table of Frienditude", the crystal bounces under a table and into a drain directly under said table. However, when the shot pans out, the drain is beside the table, not under it.

Plot hole: In "Oh Brother!" Timmy wishes for a brother who will beat up Francis and some other things. How come he doesn't beat up Francis, even though Timmy wished for it?

Continuity: In the episode Miss Dimmesdale, in the scene where Vicky has Timmy pinned to a board in the garage. The next scene shows Adam West pulling Timmy in with a claw, notice that there is nothing in the garage but in the next shot a bunch of tools appear.

Continuity: In "Oh brother!" after Timmy gets beat up by Francis, he is in his room with a lot of injuries, yet when he wishes for a new brother and his mom calls him for something, the injuries are gone.

Continuity: In Mother Nature, when Timmy goes to apologize to his Mom, the two makeup guys dissapear after his mom notices him.

Factual error: In the episode Catman Meets The Crimson Chin., When Timmy guesses the password to release Cosmo and Wanda he types CAT notice that where he hits the keys are not in the right position for typing CAT.

Continuity: 4-11: Truth or Cosmoquences / Beach Bummed: After Francis kicks sand into Timmy's face, Trixie is far from Timmy, but a shot later, they're closer together.

Continuity: Episode 4-6 "The Jimmy Timmy Power Hour": In the scene where Timmy and Cindy are in the Candy Bar their milkshake has two straws for the first two shots. But in the next shot there's only one straw which is on Timmy's side, it then moves to Cindy's side. Then when Carl, Sheen, and Libby run in both straws appear again. When they all run out there's only one straw and on Timmy's side.

Continuity: 5-59 Just Desserts. When Crocker jumps out of the open window in the classroom, notice on the exterior of the school all the windows are closed.

Continuity: Real 4-3: Baby Face/Mr. Right: When Timmy first finds the place in the license plate maker where you stick letters in, there were 7 slots, but later when we see him spelling "I wish I was ten", there are 12 slots, enough to fill in that sentence, without the spaces.

Continuity: When an 'angry' Wanda throws a styrofoam picture of Cosmo and Wanda on the floor near Cosmo, it breaks, but some shot later, both pieces are gone.

Deliberate "mistake": When Cleft (Timmy) and the Chin go to the last page with the letters and they get to Timmy's letter, Chin says he spelled Chin wrong yet you must see it's spelled right.

Continuity: When Cosmo and Wanda are saying what Vicky likes more than Timmy, their castle brick outline changes.

Continuity: This mistake is found in the episode where Timmy wishes himself into the Crimson Chin's comic book after causing the Crimson Chin to become depressed. After defeating the Bronze Kneecap, the Crimson Chin are walking, and the Crimson Chin has no cape. When they appear before a large American flag, the Crimson Chin suddenly has a long, flowing, red cape flapping in the win. When they walk into the "letters to the editor" page, the Crimson Chin no longer has a cape.

Plot hole: Timmy wishes that everybody in the world looks exactly the same. Cosmo and Wanda turn everyone into grey blobs. Yet kids are small blobs, and women are blobs with long eyelashes. They don't look "exactly" the same.