The blue alternate palette of the mid-boss Phan Phan (replacing Rolling Turtle from the original NES game) bares a slight resemblance to the Pokemon Phanphy, whose name also incorporates "phan" from the word "elephant".
The color on the game's PAL boxart is noticeably darker than the North American boxart. Because of this, Meta Knight's cape is hard to discern against the cover's background. Kirby and the game title are also a darker shade of pink, and the Nintendo Logo is next to the game's rating box rather than underneath it.
In the remake of Kirby's Adventure, Kirby: Nightmare in Dream Land, the official Japanese website for the game had many screenshots that were taken at a previous point in development. Poppy Bros. Sr. appears in one. The image shown shows that his sprite was originally going to be similar to his sprite from Kirby Super Star.