His previous album FM & AM released the same year, showed that he was already drifting towards counter-culture icon, but Class Clown was a landmark.

Besides musings about his youth, the album featured strongly directed remarks against the Vietnam War and his attachment to taboo topics.

The album contains "Seven Words You Can Never Say on Television", which became the focus of government harassment in the year that followed, and perhaps Carlin's most famous calling card.

He also lists all the nuns and priests that worked at Corpus Christi School which he had attended as a child, and who are spoken of at length through the album.

In a 2004 appearance on Inside the Actors Studio (episode 1013), Carlin explained that, "I wanted people to know that the disrespect that I had for the dogmatic aspect, and for the inconsistency, and in a lot of cases the cruelty of Catholic doctrine, was tempered with an affection and a gratitude that I had for this wonderful setting that I considered like a garden, where they let me grow, be a creative person and think for myself there, so I kind of wanted to kind of illustrate that, and go, thanks and no thanks".