As Shaggy and Scooby are walking down the corridor to Bones Malones dressing room a poster can be seen on the wall at various points advertising a band called The Why. It is similar in style and design to that of British rock band The Who's logo.
Daphne's quirk in this episode is that she keeps playing thematic piano pieces.
There is a famous musician named Tom "Bones" Malone. He was a member of The Blues Brothers Band, the Saturday Night Live Band, Blood Sweat & Tears, and the house band for the Late Show with David Letterman, among many others.