Author Existence Failure: Poor, poor Mary Wickes, Laverne's voice actress. This was her final film role as she died of cancer during production and had to be replaced by a stand in, although thankfully only for a few lines. Fortunately, that stand-in is sound-alike Jane Withers, who took over the role in much-maligned DTV sequel.
Reversed in Sweden, in the dub the same guy voices Ratcliffe and Frollo.
Mean Character, Nice Actor: In an interview for Disney Adventures that was published right around the time that the movie was released, Tony Jay made it a point to say that he was actually a very nice man in Real Life, despite continually playing villainous roles (and with Frollo being one of his darker ones).
What Could Have Been: Phoebus's speech rallying citizens to rebel against Frollo during the climax of the movie was originally said by Clopin, but the directors/producers felt that Phoebus needed to be more involved in the uprising.