During the intro cutscene, the theme from the fourth opening of the One Piece anime ("Bon-Bon Blanco - Bon Voyage") with its lyrics is used the Japanese version, but is replaced with a made-up instrumental version in the European version. The ocean ripples shown on the "One Piece: Round the Land" titlecard are also slightly different in comparison.
Additionally, the part where Luffy and his friends are running towards the screen together is a reference to the fourth opening of the One Piece anime, where Luffy and his friends are walking towards the screen together.
Additionally, the part where Luffy and his friends are running towards the screen together is a reference to the fourth opening of the One Piece anime, where Luffy and his friends are walking towards the screen together.