The Secret Box / Band Geeks - S2-E14
Audio problem: At the end of "Band Geeks" when everyone is playing "Sweet Victory" at one point Mrs. Puff is shown playing the guitar. When this happens, you can see the others in the background not doing anything, even though their instruments are heard.
Audio problem: After the donut delivery guy asks Carl why all the donuts are piling up, Carl responds with Lenny's voice.
Audio problem: When they are trying to escape Koopa and the little caveman speaks, then Luigi answers him, he has the Princess' voice.
The Sad Story of Henry - S1-E3
Audio problem: When James is about to puff away from Henry's Tunnel, if you listen closely, James is heard puffing before he has even left. (00:10:00)
Audio problem: When the boys leave, Wilma says "Drop in some time to say hello" in Betty's voice.
Audio problem: When Peter introduces the pope to his friends at work, and he is saying "Remember when we got that stripper for Charlie and it turned out to be his son? I think this is gonna top it" or something along those lines), Peter's mouth very obviously does not sync up with the words being said.
Cartman Gets an Anal Probe - S1-E2
Audio problem: After the scene where Mr. Garrison says, "You can say that again, Mr. Hat," Kyle shouts, "Give me back my brother you stupid aliens" in Stan's voice.
Clara's Dirty Little Secret - S1-E2
Audio problem: Season 1 Episode 2: "Clara's Dirty Little Secret". When Princess Clara and her Evil Stepmother make up, the latter thanks Clara before the scene switches to the Confession Room. When she says 'Thank you', her lips do not move.
Audio problem: Right after Helga is standing behind the "ARNOLD" on the pavement, when she says "Hey Arnold", her lips move as if she's saying it slowly (this is fixed in the 4th season).
Number One - S1-E7
Audio problem: In the scene where Kim is running across grass-covered Japan to stop Duff Killigan, when she talks her lips don't move along to the words.
Audio problem: As the ZZ top members are trying to convince Bobby about staying in school, there is a distinct microphone error after Frank speaks. When he says "and the presidents", you can hear it quite distinctively. It is as if he spoke too close to the microphone at the end of his sentence.
The Honking - S3-E1
Audio problem: After they have welded Bender to the wall Leela and Fry leaves. When they go outside the door is closing. It cuts and we hear the door close but we can see the door is already closed. (00:11:45)
Audio problem: At the end of this episode, Aang tells Katara that forgiveness is the first step you need to begin healing. But if you watch closely, his mouth isn't moving at all when he says this.
The Ultimate Doom: Brainwash (1) - S1-E5
Audio problem: When the Decepticon jets attack the maharaja's palace at the beginning Thundercracker speaks with Skywarp's voice. Later, at their base when the fake Optimus comes out Skywarp speaks with Starscream's voice.
Totally Spaced Out / The Switch Glitch - S2-E8
Audio problem: In Fairly Odd Parents, "Switch Glitch", Vicky forced Timmy to do her chores and homework, and stretched a dress on Timmy. He said "I can't do chores in a dress.". Vicky, however, was recording Timmy's voice on a tape, the "in a dress" part, and played the tape, but the tone of voice for "in a dress." was normal, not angry. Shouldn't it be the same?
Audio problem: The computer's voice says "golf shoes" while the screen says "golf cleates".
Audio problem: When Candice falls in the mud when talking to Stacy, she sees Phineas and she says "Hey, Phineas.", and her mouth drops open, but when she says Phineas again her mouth does not move.
Audio problem: After "Peanut Butter Kid" retrieves the baseball Vince hit (presumably all the way to China) Spinelli screams rather loudly. However her lips don't move when she does.
The End of Flutter Valley (3) - S1-E3
Audio problem: As the Flutter Ponies discuss how to escape from the giant honeycomb they are trapped in, Rosedust addresses the Flutter Ponies. Yet Rosedust is in the audience and Honeysuckle is addressing the group in Rosedust's voice.
Audio problem: In the scene where Mystique returns to the Brotherhood house, when Pietro says that their team is as tough as ever, it's Lance's voice that comes out of his mouth.