This movie was produced in 1968 but not released until the 90s. In the meantime, The Who's performance became available as part of "The Kids Are Alright"
The line of the song is "But you gripe sometimes, you just might find, you turn into seed" was a reference to the line of the song, You Can't Always Get What You Want".
Vince, mocking Mick Jagger, says "You've heard of Oxford circus, you've heard of Piccadilly circus, but tonight I present to you Vince Noir's Electro Circus." Mick introduced the Rock n Roll circus the same way.