If the player has a group containing 20 of each Pikmin type they will sing the theme song for the game.
When Pikmin 3 was localized in Europe, the enemies Yellow Wollywogs and Wogpoles had their names changed to Yellow Wollyhops and Wolpoles. This was done because "Wog" is derogatory British slang for a dark-skinned person.
Contributed by Ophl
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In the Japanese version of Pikmin 3, the Scaly Custard (avocado) is literally translated as "Crocodile Scrotum" (ワニノフグリ).
Contributed by cyanide97
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During development of Pikmin 3, a screenshot was shown of Brittany wearing a yellow suit instead of the pink suit she wears in the final release.
Contributed by TympoleLover
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Even though the naming nomenclature fits in with NASA's methods of identifying unimportant planets, the Pikmin planet "PNF-404" is potentially also a pun; "404" is a HTML status code for "Page Not Found", or "PNF".
Contributed by Smurfman256
Nintendo experimented with the possibility of putting Pikmin 3 on a handheld system like the DS and 3DS, but the gameplay boiled down to micro-management on the touch screen and didn't feel like a Pikmin game.
Contributed by DidYouKnowGaming
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When the game's characters were just starting to be released, there were to be 4 playable characters, A (Which became Alph), B (Which became Brittany), C (Which became Charlie), and D. Nobody currently knows what happened to character D, but it's speculated that because the crew's ship is named the Drake, many aspects of Character D were given to the ship.
Contributed by Kodyurem
The planet where Alph, Britanny, and Charlie come from is called "Koppai." This is a reference to Nintendo's origins, as the company was founded in 1889 as "Nintendo Koppai".
Contributed by Apacado