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• The rock formations on top of the two mountains in Toad Road (pictured) from Mario Party 9 are shaped like an "M" and "P", and the island is shaped like a 9, standing for the game's title.
• At the introduction of the Japanese version in Super Mario Sunshine, Mario can be heard saying "Looks like a giant-", the rest is inaudible. After Princess Peach notices the presence of Shadow Mario, Mario says "Looks like Mario is going to have to find a new job", and Toadsworth replies "Are you starting a new career?". These dialogues were removed from the American introduction.
• Prince Haru from Super Mario Bros.: Peach-hime Kyushutsu Dai Sakusen! is the only character in Mario series that Princess Peach has a love relationship other than Mario.
• In the Japanese version of Paper Mario: The Thousand-Year Door, Larson's house had a Toad-shaped chalk outline and dried blood on the floor. This was removed in the North America version.