Continuity mistake: When the Warners emerge from a sealed crate on Miss Flamiel's desk and start singing, Yakko instantly appears behind Wakko and Dot as soon as the shot changes.
Fortune Cookie / Dear John - S3-E8
Continuity mistake: When Filburt first reads his fortune cookie, it says "Bad luck and misfortune will infest your pathetic soul for all eternity". But later on when he is walking down the street it says "Bad luck and extreme misfortune will infest your pathetic soul for all eternity". (00:03:25 - 00:04:25)
Continuity mistake: Sonics' construction outfit disappears after he tries to break out of the cage.
Used Car/Bounty Hunters - S8-E9
Continuity mistake: In "Used Car", when Beavis and Butt-head first approach the car, it's in between two trucks, a white one and a brown one. At the end, the spot where the car was is now between a green car and the white truck.
Ryuusui, Chimaera no Otoko - S1-E1
Continuity mistake: When Crosswords has the first attack of Chimera witnessed by Black Jack, his wife Sayuri runs to the fridge to grab the bottles. In the shot with the camera inside the fridge, there is a full complement of bottles in the bottom shelf, but in the other angle the right half of the shelf is occupied by glasses only. (00:09:15)