The line "They killed Fritz! They killed Fritz!" is a reference to Robert Crumb killing off Fritz the Cat in his underground comic book series. Ralph Bakshi directed the film adaptation of Fritz the Cat (1972). Bakshi is quoted as saying, "I named the character Fritz in "Wizards," just so I could scream 'They killed Fritz!' To kill such a cat would make Don Marcus commit suicide."
The song played on the German propaganda film is the Nazi Party anthem, "Die Fahne Hoch" ("Raise the Banner"). It was written by an early party member, Horst Wessel. The song is popularly known as "The Horst Wessel Song".
Susan Tyrrell specifically requested to be uncredited for her role as the narrator, believing that performing in an animated film would be detrimental to her career. Ralph Bakshi claims that she approached him years later and revealed that the movie had actually been instrumental in securing her many subsequent roles and that she regretted her request.
44 minutes into the film, when Weehawk falls into a chasm but urges Avatar to go on, Avatar appears to mutter a spell: "Morrow crinkle frizetta." This is a reference to fantasy illustrators Gray Morrow, Frank Frazetta and Frank's best friend, Roy Krekel.
Alfie tells Pubital not to worry, and describes past engagements with Blackwolf which have always ended in victory. Actually, in warfare, when it doesn't seem possible to lose, that is when you must worry the most.
When the film was first released in New Zealand, it was given the M rating, due to the film's animated violence, profanity and sexual content. But, when the film was released on DVD in New Zealand in 2011, it was re-rated PG. The film was given the PG rating in England and in America.
Since the film's release, Ralph Bakshi had wanted to make a sequel "Wizards 2" and that the plot would focus on Avatar and Elinore's relationship, which doesn't work out because Weehawk gets in the way. But due to production difficulties and other projects, the sequel never happened.
Considering the fact that both Blackwolf and Avatar are described as polar opposites of the same power that gave them birth, it is physically impossible for one to live without the other. That means that Blackwolf's power was passed on to his son after his death.