The Big Superhero Wish - S4-E3
Continuity mistake: Probably around the time when Elmer (kid with boil) the normal kid bends the Baby Shredder (Vicky's) claws, the boil jumps from one cheek to the other, and Elmer's making it do that.
Vicy Loses Her Icky / Pixies Inc. - S4-E4
Continuity mistake: When Ms. Waxelplax tries Timmy's homemade golf course, her ball hits a windmill, knocking it loose. The windmill flies forward like a propeller but on the next cut, flies sideways.
Vicy Loses Her Icky / Pixies Inc. - S4-E4
Continuity mistake: When HP does his ball for hole 1, it flies up, and falls diagonally, but at the next shot, it falls vertically.
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.
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.
Smart Attack/Operation F.U.N. - S5-E15
Continuity mistake: In "Smart Attack", the scientists in the audience blow up, scattering shoes, glasses and clothing everywhere. In a few shots, after Timmy's dad is changed back to normal, all the clothing and accessories disappear.
Smart Attack/Operation F.U.N. - S5-E15
Continuity mistake: In "Smart Attack", Timmy's dad burns a plate of food right in front of Timmy. In a few shots, the plate disappears.
Odd Squad/For Emergencies Only - S6-E4
Continuity mistake: In "For Emergencies Only", Mr. Crocker's hair is sent back from the pop quiz, and in the next shot, it's back to normal.
Odd Squad/For Emergencies Only - S6-E4
Continuity mistake: When the "Odd Squad" is in Mama Cosma's house for the first time, there is a picture of her by the door. The second time they come, it's gone.
Wishology! 'The Exciting Middle Part' - S7-E2
Continuity mistake: Timmy and Mark are swimming through the sewer to escape the Chester and AJ impostors and escape through the top. When they land outside of it, onto Timmy's front yard, they are completely dry.
Continuity mistake: In 3-8 "The Secret Origin of Denzel Crocker", it showed that Mr. Crocker was 40 years old. (They went back 30 years to his childhood, and he was 10 then.) But in this episode it showed that he was 53 years old. (Everyone aged 50 years, and he was 103. 103-50=53.).
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.