During the development of Kirby's Dream Land, HAL Laboratory provided Masahiro Sakurai with a Twin Famicom, a console that combined the standard Famicom and Famicom Disk System, to use as a development kit. The hardware did not feature physical keyboard support, meaning that values had to be inputted using a trackball and an on-screen keyboard. At the time, Sakurai was under the impression this was "the way it was done," and he coded an entire functional test product using just the trackball. He claimed the process led to some improvements managing the game's "data processing load," allowing it to have "very smooth movement for a Game Boy game."

Masahiro Sakurai claimed in a YouTube video he made about the game's development that he got a lot of push-back from his Nintendo developer peers over his choice to make the game extremely easy, casual, and accessible, something that would eventually become a series staple. This was because developers like Nintendo usually made games incredibly difficult at the time due to low memory storage space on the game cartridge, which led to a need to make the gameplay feel longer so it felt like gamers were getting their money's worth.

In the Extra Game credits, Chuckie's name is erroneously switched with Hurly's.

The game's title screen was changed significantly when localized internationally. The background was likely removed to accommodate the larger title text.

The reason why Kirby is colored white in the American cover for Kirby's Dream Land is because Nintendo of Japan were debating whether Kirby's color should be pink or yellow. The game's creator Masahiro Sakurai wanted pink, but Shigeru Miyamoto thought yellow would be better; Sakurai eventually won the debate. However, Nintendo of America didn't know if Kirby was pink or yellow at the time of making the box art, so they decided to play it safe and make Kirby white like he appears in the game.

Lololo and Lalala, two recurring bosses throughout the series starting with Kirby's Dream Land, are actually Lolo and Lala from Eggerland/Adventures of Lolo. Both Kirby and Eggerland were developed by HAL Laboratory.

By waiting for 20 seconds on the pause screen, Kirby will dance. This only happens once for every time you pause the game, and can only be seen again by unpausing the game, pausing it again, and waiting another 20 seconds.

Kirby's victory dance was going to have individual sprites that show Kirby dancing, but because there wasn't enough memory, the developers used a combination of Kirby's regular move-set to make it look like Kirby's dancing.