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.
He's Too Sexy for His Fat - S2-E17
Audio problem: When Peter is driving in the car, he can't stop admiring himself in the rear view mirror. He is talking while looking in the mirror, but you can see the corner of his mouth not moving. (00:20:58)
A Picture Is Worth 1,000 Bucks - S2-E11
Audio problem: When Peter comes out of the bathroom with wet hands and goes to dry them, the sound of the dryer is heard before he touches the button.
Audio problem: At the piano competition you see Peter playing towards the left side of the piano and hear the pitch going higher. This wrong because the keys for the high pitches are on the right side of the piano.
Audio problem: When Brian says "Well so much for finding food at the Stop 'n' Shop", his mouth doesn't move. (00:09:10)