Funny Music References on TV

I was watching Californication, the other night and was rather amused when Henry Rollins' character (or was he just playing himself) mentioned the books that Hank Moody (David Duchovny's character) had written during their interview. The books were South of Heaven, Seasons in the Abyss, and God Hates Us All. I found this rather amusing as these are all titles of Slayer albums. I wonder if this was Rollins' idea or if this was something one of the writers actually wrote in.