Donkey Kong Country 3: Dixie Kong's Double Trouble!
Donkey Kong Country 3: Dixie Kong's Double Trouble!
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Donkey Kong Part 3 - Did You Know Gaming? Feat. TheCartoonGamer
 
According to an anonymous whistelblower, the developers of the GBA remake intended to include both Eveline Novakovic's soundtrack from the SNES version and the new soundtrack by David Wise. However, space limitations on the GBA cartridge and time constraints forced the staff to solely use Wise's soundtrack.
Contributed by game4brains
Due to some unknown error, many US copies of the SNES version are missing the KONG letter 'G' in the level Rocket Rush. All other regions and the GBA re-release have the letter present.
Contributed by KidDivinegon
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An anti-piracy routine can be triggered when no SRAM is present, similar to Donkey Kong Country 2.
Contributed by GamerBen144
When you go to Bazaar's General Store and buy a shell, you have the option to ask him about the castle in the distance. He'll tell you about it for 2 coins, but if you decline he'll tell you something much more interesting:

Are you sure? Some cheeky lad called Link was in just last week and he asked about the castle too. He didn't have enough coins, but he seemed such a nice fellow that I agreed to accept 500 rupees instead. After that he left... muttering about my shells being the wrong shape or something. Oh well!

This is a reference to The Legend of Zelda: Link's Awakening in which sea shells were collectible items.
Contributed by Bean101
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When visiting Wrinkly Kong's Save Cave, she can be seen playing a Nintendo 64, and "Inside the Castle Wall" (Peach's Castle Theme) plays on the background. It can be assumed that she's playing Super Mario 64.
Contributed by fifosexapel