* ActingForTwo: Barrie Ingham voices both Basil and the unlucky Bartholomew.
* AwesomeDearBoy: Price on his role as Ratigan. He had stated that Ratigan was his favorite film role.
** Having a song written for him certainly helped.
* DuelingMovies: With ''WesternAnimation/AnAmericanTail'', another animated movie about mice coming out the same year (though it didn't come out until a few months afterward). While the film made it's money back, ''American Tail'' was a smash hit and was, at the time, the highest-grossing animated feature ever made. Both of these things would factor into Disney deciding to re-beef their animation department.
* ExecutiveMeddling: Largely averted, as Jeffrey Katzenberg had little to no faith this movie would be any good. Most of his attention was spent on meddling with ''Disney/TheBlackCauldron'', which became a failure. Katzenberg did, however, demand the title of this film be changed from "Basil of Baker Street" to simply "The Great Mouse Detective", a move that inspired an infamous fake memo that became a category on ''Series/{{Jeopardy}}''. Two of the four directors have since said they've always hated the new title.
** However those directors may have had some solace in the title being changed to "Basil the Great Mouse Detective" is some countries, including Australia.
* HeyItsThatVoice:
** The voice of Sherlock Holmes is that of Basil Rathbone, who is one of the better known actors associated with the role.
** VincentPrice, a one-man RoguesGallery of villain voices, including Professor Ratigan. Also,
** [[http://en.wikipedia.org/wiki/Melissa_Manchester Melissa Manchester]] does [[http://www.youtube.com/watch?v=e2IctxaCPqw a Victorian strip tease]]! In a BadGuyBar!
** Hiram Flaversham is performed by Creator/AlanYoung in the same Scottish burr he used for [[WesternAnimation/DuckTales Scrooge McDuck]].
*** In Mexican Spanish, it's ''Fidget'' (the bat) who's Uncle Scrooge.
*** In Italian, it's ''Dr. Dawson''.
** Wayne Allwine (MickeyMouse himself) voices one of Ratigan's {{Mooks}}; to be precise, [[Disney/AliceInWonderland Bill the Lizard]].
** In Italian, Olivia would later become [[Franchise/StarWars Padme]]!
** In Japan, the voice of Fidget is also the voice of [[Franchise/SonicTheHedgehog Dr. Eggman]]! Even better, Ratigan is [[{{Disney/Aladdin}} Jafar]].
** [[CatsAreMean Felicia]] is voiced by [[ScoobyDoo Fred]] [[FrankWelker Jones]].
** Though it's rather hard to tell, the lady mouse who comes to see Basil at the end of the film is none other than [[Theatre/{{Oliver}} Nancy]] herself!
* HilariousInHindsight: The box that Olivia is sitting on when Dawson finds her reads "Dr. Gaston's Liver Pills." 5 years later, we would meet [[Disney/BeautyAndTheBeast Dr. Gaston]], and he was evidently health conscious, based on eating 4 dozen eggs every day.
* IAmNotShazam: The lead dancer at the bar is listed in the credits as "Miss Kitty Mouse," but, Fanon aside, this doesn't actually appear to be her name. Rather, it's a description of her. She isn't "Miss Kitty Mouse," but "the Miss Kitty mouse."
* WhatCouldHaveBeen: Music/{{Madonna}} was considered to voice Miss Kitty and perform the song "Let Me Be Good To You".
** This isn't as far-fetched as it may seem when one listens to Madonna's jazzy showtunes on the ''Film/DickTracy'' soundtrack.
** Olivia was originally planned to be older, acting as a potential love interest for Basil, but it was later decided she should be a child to make her more sympathetic.
** Creator/JohnCleese was the first choice to voice Basil.
** Ratigan's original design was [[LeanAndMean very thin and frail-looking]]. They changed it after Creator/VincentPrice was cast [[InkSuitActor to reflect Price's larger build]]. Glen Keane also says that he based it partially on then-head of the studio, Ron Miller, an ex-football player.
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