The Onion did a series of transcripts of "unused audio commentary" for the Lord of the Rings DVDs narrated by Howard Zinn and Noam Chomsky. They sounds similar to what you describe, and are a great parody of both the story and the narrators:
https://www.mcsweeneys.net/articles/unused-audio-commentary-...
https://www.mcsweeneys.net/articles/unused-audio-commentary-...
https://www.mcsweeneys.net/articles/part-one
https://www.mcsweeneys.net/articles/part-two