Even the title screen has a hilarious detail: wait a short while, and Dedede will get the rest of the group's attention and pull a stupid face. The priceless part is their reactions. Bandana Waddle Dee laughs, Kirby is confused, and Meta Knight just looks plain embarrassed and shakes his head.
In Multiplayer mode, every character can fly. Kirby and Dedede inflate themselves. Meta Knight has wings. So logically Bandana Waddle Dee flies by awkwardly squatting repeatedly. It truly is a sight to behold.
In the last cutscene, Kirby and his friends are on Planet Popstar. Kirby wakes up and sees Bandana Waddle Dee and Meta Knight nearby. They find Dedede stuck in the ground headfirst. He spends the rest of the scene with a flower stuck to his head.
The Grand Doomer's entrance, where Kirby grabs the mast, with the proper Item Get! theme, then it flies away in the process and it appears.
Ultra Sword occasionally pulls out a paper fan and a huge fish.
The fish being a Visual Pun just makes it even funnier.
In the cutscene after defeating Landia, while Magolor is explaining his betrayal, Dedede keeps a hilarious Jaw Drop throughout the whole scene.
And then later, as Magolor leaves for Dream Land, you can also see Bandana Waddle Dee flailing his stubby arms.
The opening cutscene, mainly, for Meta Knight attempts to ignore Kirby and King Dedede's antics and read a book.
When Kirby and co turn to look at the bright light in the intro, you can see Kirby quickly turn back to the slice of strawberry shortcake that Dedede was chasing him for.
Everyone does the Kirby Dance in this game. You get to see Meta Knight moonwalk.
Meta Knight, quite possibly the rawest force of badassery in the Kirby universe, dog paddling around on the surface of the water in a cute purple inner tube.
And wearing a scuba mask over his regular mask when swimming underwater.
Sometimes when beating a boss and collecting the a piece of Lor, Dedede will pull the most sour of faces at Kirby after the dance.
The Puzzle Swap picture for this game involves Waddle Dee, Meta Knight, and King Dedede (in that order) jumping onto Kirby like a tower as he runs past them, only for Magalor to appear from his ship, jump onto King Dedede, and cause them all to fall. Kirby can apparently only balance three other beings on top of him at a time.
The instructions for Bomb Kirby. In particular, the Self-Destruct one, in a morbid way. "Bomb Prep... do.. nothing."