I took my Classical Music final today, and forgot that Nonon was a band director. I just about lost it at the William Tell Overture. But yeah, that episode was exciting.
Also, I know in TTGL every time Gurren and Lagann transformed, they played the theme, but hearing Ryouko shout out "life fiber synchronize, Kamui Senketsu" so many times is kind of getting annoying.
My friend also thinks that Ryouko's and Kinagase's hair colors are too similar (and he speculates some family relationship between the two)