While Huey was playing the organ, sometimes all the keys are in white, sometimes normal and sometimes there are no keys!
On the release of the Quack Pack DVD the artwork on the box refers to the set as Volume 1 but the actual menu of the DVD reads The Best Of Quack Pack.
This episode was released in Quack Pack: Volume 1.
Phantom of the Opera
Huey playing a organ underneath the house is reference to the Gaston Lereux novel Phantom of the Opera, where the title character lived underneath the Paris Opera House