Metal Head manages to win the children over by demonstrating the artillery work of his trade. If it weren't for the Joes, Cobra may have very won over one school.
Aside from terrible snake puns and Cobra characters, the books were still accurate.
Cobra's plot to take over the world by burning history book and replacing them with altered books is similar to what Hitler did during WWII when he burned books to control what people especially children believe.