In the masquerade party characters are dressed up as: Zorro, Batman, Superman and one character is dressed up as the teenage mutant ninja turtles.
The Burger King Kids Club video release of this episode was titled "April Foolish".
The plot of this episode is similar to the Mark Twain novel The Prince and the Pauper as April and Princess Mallory look alike. When April gets mistaken for the Princess, she went along with it and wanted to experience Mallory's royal life while Mallory was unhappy always being treated like a child by her father and the guards, she ran away from the embassy and took an interest to explore the outside world.
One person at the costume party is dressed up as Batman. Years later, there would be a comic book crossover and animated movie called Batman vs The Teenage Mutant Ninja Turtles. Donatello would also wear a Batman like costume in the season 7 episode "Night of the Dark Turtle".