Rob Paulsen provides the singing voice of Hades, making this the first - and, as of 2015, only - Disney production where the character is voiced by someone other than James Woods.
Despite being the main villain of the House of Mouse (2001), Pete was not involved in the villains taking over the club.
Although featured on the film's VHS cover, Kaa is not the main villain of his film, The Jungle Book (1967). He does, however, assist the other villains in kicking Mickey and Minnie out during their musical number, and Shere Khan is nowhere to be seen throughout this film.
Towards the end of the film, as Mickey prepares for battle against Jafar, the camera pans on all the villains the same way the camera pans on the dinosaurs before viewing the Tyrannosaurus Rex in Fantasia (1940).
Villains that are present and can be seen in the movie are: Big Bad Wolf, Hades, Captain Hook, Maleficent, Evil Queen/Witch, Queen of Hearts, Pain & Panic, Cruella de Vil, Madam Mim, Jafar, Judge Claude Frollo, Ratigan, Fidget, Chernabog, Lady Tremaine, Ursala, Iago, Shenzi, Banzai, Ed, Mr. Snoops, The 3 Fates, Drizella & Anastasia, Cheshire Cat, Gaston, Si & Am, Kaa, Prince John, Pete, Lucifer, Jasper & Horace, and Lefou. You can also see the Lonesome Ghosts, The Queen of Hearts' Army of Cards, Maleficent's Goon Troops, and the Neverland Pirates.