Well, no! No this is a valid topic so don't make fun! I think about that too on occasion haha--
In both "Breakthru" and "Headlong" they mention the word "headlong"...
Fat Bottomed Girls appears in the song of the same name, as in Bicycle Race, and in More Of That Jazz.
Somebody To Love appears in the song of the same name, as in Sail Away Sweet Sister
Keep Yourself Alive appears in the song of the same name, as in Dead On Time