The first poster for Festeroo actually features five bands Les Claypool has played with. Oysterhead, Les Claypool's Frog Brigade, Sausage, The Holy Mackeral, and C2B3 (Colonel Claypool's Bucket of Bernie's Brains).
The name of the yoko ono type character in this film is named Mai pang, this is a reference to the oyster head song shadow of a man
Wavy Gravy is credited as a "legend, mythical being/flavor of ice cream". Ben & Jerry's made a since-discontinued ice-cream flavor that was named after him.