I was watching the episode "The Private Ear" yesterday and noticed when Greg and Marcia played the trick on Peter and recorded the conversation about the surprise party for Peter, Greg said into the recorder that Peter "buckles down and gets an A." When Peter played back the recording "buckles down" was missing from the sentence.

Good catch. I will try and observe that next time. I wonder if it was a goof or did they edit out words to get more commercial time. Anyone have this on DVD to know for sure?