Listen closely to Jackie Robinson's voice. That's Will Smithnote credited as "the Fresh Prince" in his acting debut, one full year before The Fresh Prince of Bel-Air. (Scratching, as always, provided by DJ Jazzy Jeff.)
This is also true for the foreign versions of the film: in the Italian dubbing, for example, Sgt. Olga is voiced by Amanda Lear. In the 2010 Japanese DVD/BD edition, Anne is voiced by Maaya Sakamoto, and Peter by none other than Takuya Kimura.
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 unavaiable 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!
Originally, Olga's dog was not named. It wasn't until some of the actors nicknamed it "Mr. Goebbels" was it put in the script.
What Could Have Been: 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". 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.
Due to the success of the movie's DVD release in Japan (see Keep Circulating the Tapes above), a world based on the movie was allegedly planned for Kingdom Hearts 3D, complete with boss battle against Mengele in his Archangel form. However, halfway through development, Tetsuya Nomura realized how bizarre and insensitive the concept was, and the world was removed and hastily replaced with one based on Mickey, Donald, Goofy: The Three Musketeers.
Relics of the battle's concept can still be seen in the fight against the Belief boss in Bayonetta 2, however.