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According to Oliver Wade a sequel to Maui Mallard was planned, some animations for the sequel were made, along with a new character line up for the game, but Disney wasn't interested in funding a sequel after the mediocre success of the original. Oliver doesn't remember what the story would have been other than that it would have involved zombies, pirates, plant people, and sea monkeys.
Contributed by CLXcool
The game was released in Europe and Japan as Donald in Maui Mallard, but in the US, it was released as Maui Mallard in Cold Shadow, and all references to Donald Duck were removed. This was due to Disney's marketing department, who claimed that Donald Duck was no longer 'hip' in the US.
Contributed by RadSpyro