Almost all of the master tapes, cells, and original drawings were reportedly destroyed shortly after the film was released. You can find a full copy of it on pirated tapes of Bambi 2002.
The Latin American cut has only one known film reel to have survived, it resides in a museum in Santiago, in a room unavailable to the public. It's screened only once a decade and you have to pay an exorbitant fee to see it.
The only DVD release thus far is a 20th anniversary edition for the Japanese dub in 2010 (which, ironically, also contains a new dub). It exists because the anime versions of The Diary of Anne Frank are very popular in Japan, which has very few Jews and hence very little cultural sensitivity to what happened during the Holocaust.
Misaimed Fandom: A noticeably large portion of this film's cult followers is made up of Neo-Nazis and other equally-minded individuals (forobviousreasons), even though the director himself said that he didn't intend to outright lionise the Nazis, but to 'disarm' some of their more disturbing deeds so it wouldn't scare children in the audience.
Old Shame: If you talk to any of the actors mentioned on this page, as well as anyone who worked at Disney in the late 1980's, they will totally act like this movie never actually existed and that they don't know what you're talking about. Go on, try it!
The Other Marty: Initially (re: 1984), the film's cast was slightly different: Lara Jill Miller (at the time starring on Gimme a Break!) as Anne, a then-unknown River Phoenix as Peter, Patty Duke as Olga, and Valerie Landsburg as Margot. Timothy Dalton and Christopher Walken were still in their respective roles of Ludvig (then named Sigmund) and Mengele, while Madeline Kahn, Alfonso Ribero and Robbie Rist were cast in unspecified rolesnote Kahn's character is speculated to be a precursor to Marie Rose-Blanche, while Ribero and Rist were reportedly both considered for the role of Fritz Pfeiffer. While it is still unknown which of the two got the part (they're not telling), other rumors circulate that Rist was cast as an early version of Miep. Only about a week into her recording sessions, Miller was told that her Anne was "too sincere" for then-screenwriter Harlan Ellison's vision, and she was replaced by the slightly grittier Molly Ringwald. It is unknown how much the other actors completed (if at all) before they too were booted, though some of Miller's voicework was worked into the final film: She "plays" a young Auschwitz prisoner who has one or two lines during the scene leading up to the shower dance.
There were some reports of adding an attraction based on this movie to Disney World; namely the German Pavillion of EPCOT was to have added an Auschwitz-related attraction. The reports did not have any details on what exactly the attraction would consist of other than it would be "designed to be entertaining, but educational at the same time". It helps that the ride was technically half-finished, as at least one report stated that the show building for the scrapped Rhine River Cruise would have been used. However, before more details could be discerned, the severe backlash from the movie resulted in the project never being mentioned again.
Pete Townshend was considered for composing the film's score, but he backed out because he was too busy recording The Iron Man. It makes you wonder how it would've turned out.
Relics of the battle's concept can still be seen in the fight against the Belief boss in Bayonetta 2, however.
Disney, prior to the film's release, developed a plan for a sequel that would focus on Anne's fictional daughter Anya as she searches for her lost younger brother Claus in Cold War-era Berlin, while Stalin's right-hand man Colonel Polov Vlagavich tries to catch her. However, due to the severely disappointing reaction to the film by critics and audience members, production was quickly ended and the animated sequences that were completed were retrofitted into other Disney works.
However one solitary piece of the storyboard exists to this day, in the lobby chandelier of Disney's Art Of Animation Hotel in the Walt Disney World Resort hotel. It's hard to see, and most people assume it's from The Little Mermaid.
There are, however, plans by a group of internet animators, musicians, and voice actors to make an unofficial fan production.
The Inspector Javertfan club has expressed outrage at the plot line, because Colonel Vlagavich would be an example of the trope Inspector Javert, and they don't want their hero to be vilified by connection.
There was some talk of the film being brought into the Kingdom Hearts saga. There was even a planned scene of Mickey Mouse himself fighting through a wave of Nazis all on his own and friggin' killing Hitler! (who's evil was so strong he could control the Heartless) Sadly, this idea was scrapped.
When the film was being developed around 1984-85, it was going to be written by Harlan Ellison as a darker, PG-rated family drama without songs, and be significantly more faithful to the original book, including Anne actually dying at the end. The failure of The Black Cauldron is credited for setting off a chain reaction resulting in the film that was presented to us briefly in 1989.