Brian records his 'Bite' Album in the studio and sings 'K-9' (or rather speaks).
This is a reference of the famous 'White' Album by 'The Beatles'.They also had
a track called 'Revolution No.9'.(which is kind of a collage of soundbites and spoken words).
In the scene when Brian is riding in front of the balloon of himself as Hops The Dog, Chris says "where's dad?" this is a reference to the assassination of JFK in Fort Worth Dallas in 1963
The production code was FACX20.