I found this while playing this game a few hours ago. When you talk about how the song "Whiplash" is very popular. there are 2 messages the first being you saying "Have you heard the Song Whiplash its really good!" and the second is "Did you know that... more
In Thrillville 2121 (I think) Talking to a clown alien may result in it saying "This planet looks mostly harmless."
This is a reference to the Hitchhikers Guide to the Galaxy, Where the earth's entry in the guide was "Mostly Harmless".