There was a lot of controversy over the intensity of Sykes, Roscoe, and Desoto, there was a feeling that the characters were too dark to be in a kids show. Not to mention the train scene where Sykes is killed in a massive explosion.
Of all the famous names in the voice cast, only Cheech Marin (Tito) has ever done more voices for Disney films. in 1994, he was heard as Banzai, one of the hyenas in Disney's blockbuster "The Lion King", and in 2006 Cheech voiced low-riding Ramone in the smash Disney-Pixar "Cars" franchise.
Neither of them were ever well recognized in the movies, but Mulligan won an Emmy or two for his sitcom "Empty Nest", and Browne was well-known for guest spots on many programs, netting an Emmy for his appearances on "The Cosby Show".
A sad addition, veteran comic actor Dom Deluise(Fagin) passed away in the summer of 2009.
Before voicing Oliver, Joey Lawrence was well known for his years on the 80's sitcom "Gimme A Break!", and the same fall that the movie came out began playing a low-I.Q. brother to "Blossom". By the time that series was over, his voice had dropped too far to sound like Oliver anymore, but his TV career continues with the ABC family series "Melissa & Joey".
Robert Loggia (Sykes) had a long career in movies, often playing bad guys in films like "Scarface" and "Prizzi's Honor", but after voicing Sykes and playing a toy company CEO alongside Tom Hanks in "Big" (Yes, that's him with Tom dancing on the giant piano), he turned more toward playing tough-but-good guys, appearing in films like "Necessary Roughness", "Independence Day" and "Return To Me".
Sadly, Loggia passed away in 2015, after a long battle with Alzheimer's Disease.
If you look closely during the song "Why Should I Worry?" you can clearly see Lady, Tramp, Trusty and Jock from "Lady and the Tramp", as well as Pongo and Perdita from "101 Dalmatians", parading along with other dogs after Dodger.