Continuity mistake: In the movie "Channel Chasers," when Timmy and Vicky go into Maho Mushi, Timmy gets a piece of his hat sliced off and Vicky gets the tip of her ponytail sliced off. But in the next shot, they're both back to normal.
Fairy Friends and Neighbors/Just the Two of Us - S4-E11
Continuity mistake: 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.
The Secret Origin of Denzel Crocker - S3-E8
Continuity mistake: In an earlier episode, we see that Timmy's dad looks exactly like him as a child, but in this episode, they look completely different.
Where's Wanda? / Imaginary Gary - S3-E12
Continuity mistake: When Wanda is in Level 14 Probation, Mama Cosma writes "Level 14 Probation" (in capitals and lowercase letters) on the board, but when Wanda yells "NO..", the board reads "LEVEL 14 PROBATION" in capitals.
Beddy Bye / The Grass is Always Greener - S3-E7
Continuity mistake: In 'The Grass...,' when Timmy is juggling a bear, the bear wrestler, and the lead carny, there is a close-up of the lead carny as he flies past the camera over and over, yet you never see the bear or the bear wrestler fly past the camera.
Continuity mistake: 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.
Father Time! / Apartnership! - S1-E4
Continuity mistake: 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.
Beddy Bye / The Grass is Always Greener - S3-E7
Continuity mistake: In the scene when the Sleep Fairy shrinks while talking to Timmy, he measures himself. The ruler says three inches. Then he shrinks down to two inches. The camera cuts to Timmy. Then it cuts back to the Sleep Fairy, who quickly discards the ruler. If you are fast enough, you'll notice that the ruler says he is three inches again.
Beddy Bye / The Grass is Always Greener - S3-E7
Continuity mistake: Beddy Bye- In an early scene, Timmy's parents are watching "Up Late in Dimmsdale." In a later scene, when Timmy is featured on the show after they've run out of guests, the sign behind him is "Late Night in Dimmsdale" instead of "Up Late in Dimmsdale" like it was before.
Most Wanted Wish / This is Your Wish - S3-E4
Continuity mistake: In Most Wanted Wish, the teleporter to Texas has 3 red dots on the top right and left. When Timmy makes it to Texas, the ones on the top right disappear.
Continuity mistake: 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 mistake: 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.
The Secret Origin of Denzel Crocker - S3-E8
Continuity mistake: At the start of this episode, Crocker breaks a picture of himself as a kid. A shot later when Timmy looks into the window, the broken picture disappears.
Continuity mistake: 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.
Truth or Cosmoquences/Beach Bummed - S5-E2
Continuity mistake: After Francis kicks sand into Timmy's face, Trixie is far from Timmy, but a shot later, they're closer together.
Continuity mistake: In the TV movie, "Channel Chasers," Vicky makes herself 18, changing the shape of her body. But later there's a brief shot of her in the place where you can get into any channel, and her body's the same as it has been in any other episode. But later she goes to face Timmy and she's 18 again.
Chin Up! / Dog's Day Afternoon! - S1-E5
Continuity mistake: When Cosmo and Wanda are saying what Vicky likes more than Timmy, their castle brick outline changes.
Super Bike / A Mile in My Shoes - S2-E6
Continuity mistake: When Vicky breaks a dish and dumps garbage in the sink that Wanda (as Timmy) was using to wash dishes, and gives her a shovel, one shot later the garbage disappears.
Continuity mistake: In Mother Nature, when Timmy goes to apologize to his Mom, the two makeup guys dissapear after his mom notices him.
Continuity mistake: 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.
Answer: It's a joke. One cannot list all forms of entertainment. The list would never end. The boys were trying to convey how superior they were to the others, by saying that they were too good for comedy.