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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.
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In the E3 2003 version of the game, the logo for Luigi Circuit was different.
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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.
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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.
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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.
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