Along with Der Fuehrer's Face (1942) Disney once said that this film will never be released again in any format. However, both films have been released on a DVD set chronicling the studio's WWII films in 2004.
When Hans is sick, the narrator mentions that his mother has a fear that "the unfit are taken away by the state, and are never heard of again." During the Third Reich, the Nazis institutionalized children with physical and mental handicaps and secretly euthanized them.
In the opening scene, the 'Verboten' list of forbidden names shows Franklin, Winston and Joseph at the top, a reference to the three Allied leaders - Franklin D. Roosevelt, Winston Churchill, and Josef Stalin. The rest are, like Joseph, a succession of Hebrew (read: Jewish) names. During the Third Reich, the Nazis attempted to ban the use of the Old Testament in church practices.
During the book-burning scene, there is a brief shot of a copy of Mendelssohn's Wedding March being burned (the soundtrack also includes a brief snatch of the same music). The German Jewish composer Felix Mendelssohn was banned by the Nazi regime from radio and public performance, and all monuments to him were destroyed under Hitler.
Other names on the verboten list: Clyde, Ezra, Nick, Maxim, Moab, and Everet (sic). The Moabites were a nation that was ethnically distinct from the Israelites, often in conflict with the Israelites throughout the Old Testament. The name Maxim is common in Slavic-speaking countries, notably Russia, Ukraine, Belarus, and the Czech Republic.