I recently rewatched The Great Mouse Detective after stumbling across it while browsing movies on Apple TV. I remembered this movie fondly from my younger years, and I wanted to introduce my little sister to it. Luckily it wasn't just nostalgia I was recalling. I really enjoyed this classic Disney film.
Turns out, there is some really fantastic stuff on the web about The Great Mouse Detective. I found most of it via its Wikipedia page. After a bit more research I later discovered it has a important role in Disney history:
The first Disney animated feature greenlit for production by the new Disney management team of Michael Eisner, Frank Wells and Jeffrey Katzenberg was not The Little Mermaid, but a charming, often neglected little film titled The Great Mouse Detective. It saved the future of Disney feature animation.
I highly recommend you check out part one & part two of this incredible story. Little did I know this movie is responsible for ushering in the Disney Renaissance. To top it all off, it also received two thumbs up up from Siskel and Ebert.
I highly recommend The Great Mouse Detective.