Remy Rides Again/Hassle in the Castle - S5-E10
Revealing mistake: In the episode Hassle In The Castle, in the hall of Infamy the name plates are either scribbles or they're just blank.
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.
Timmy the Barbarian/No Substitute for Crazy - S5-E18
Character mistake: In 'No Substitute for Crazy", When Timmy and Sanjay are leaving the school after Mr. Crocker falls down the well, a few cats come up to them and he introduced an orange one as "Omar." Later, when Mrs. Sunshine is leaving after being substitute for a day, Sanjay has cats around him and comforts "Omar", except he says this to a red cat, not an orange cat.
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.
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.