Mario Kart: Double Dash!!
Mario Kart: Double Dash!!
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Mario Part 4 - Did You Know Gaming? Feat. Yungtown
 
The game contains two unused hot air balloon models with the "Mario Kart" title written on them. Despite the fact that they cannot be found in the final game, both can clearly been seen in pre-release screenshots of the "Dry Dry Desert" level.
Contributed by MeleeWaluigi
In the E3 2003 version of the game, the logo for Luigi Circuit was different.
Contributed by MeleeWaluigi
In early screenshots of Mario Kart: Double Dash!!, Luigi Circuit has larger mountains, more sunflowers, is missing the "Luigi Circuit" sign, and no arrows painted on the road.
Contributed by MeleeWaluigi
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Rainbow Road contains a heart placed outside the skybox, which uses the red shell texture on the front and a yellow texture on the back.
Contributed by MeleeWaluigi
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Mushroom Bridge is almost the exact same shape as Mario Circuit 1 in Super Mario Kart.
Contributed by CuriousUserX90
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A lot of the tracks in Double Dash are connected by landmarks in the background. For instance, it's possible to see the mountain from D.K Mountain in the background of Dino Dino Jungle.
Contributed by MidnaLove
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Entering L, R, L, R, X, Y, X, Y, Z from the menu shown after a race will reveal a code on the bottom of the menu. Despite being present in all versions of the game, this code has only been used for a contest in Japan.
Contributed by GamerBen144
By holding X or Y when the Nintendo screen is shown and 'Nintendo' is spoken, Lakitu will appear with a fish on the end of its fishing pole instead of the usual traffic lights.
Contributed by KidDivinegon
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The similar structure of buildings in the game's stage preview icon suggests that Rainbow Road takes place above Mushroom City, another course in the game.
Contributed by DidYouKnowGaming
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There's an error on both the PAL and US box art of Mario Kart: Double Dash which displays the "L" on Luigi's cap as being backwards.
Contributed by Frazzle
Luigi's Mansion can be seen in the background of Luigi Circuit. It's the same mansion seen during the Rank A ending of the game Luigi's Mansion.
Contributed by Bean101