The Scary Sky Skeleton - S1-E6
Audio problem: During the gang's ride on a bumpy road Fred warns Shaggy, Scooby, and Scrappy about some more bumps coming up. He's interrupted when they hit the bumps, then the word "bumps" comes out of Scooby's mouth.
Audio problem: In the Governor's office, as Clayton was recording a memo, Benson complimented him, saying, "Nice work, Clayton." However, if you listen closely, you notice that Benson's voice ended on a higher note than on the recording.