This page explains in detail the interactions between the Mario series and the Mary Poppins series.
Mario Party 5[]
November 10, 2003
Mario
Mary Poppins
One of the minigames in Mario Party 5 is called "Merry Poppings" as a reference to Mary Poppins. In it players control characters suspended in the sky with thirty balloons, and must pop the opponent's baloons to make them fall.
License[]
The creators of Mario Party 5 don't hold any right over Mary Poppins, but they only included a subtle reference.