Although he appears to be a flat sprite, Mr. Game & Watch is actually a 3D model designed to look 2D from the perspective of the camera.

During the game's development, Lucas - the protagonist of Mother 3 - was briefly considered as a replacement for Ness by the development team. However, due to the delays surrounding Mother 3's original Nintendo 64 release (and that game's eventual cancellation), Ness returned instead as they originally planned.

Both Ness and Lucas would go on to be playable in this game's sequel, Super Smash Bros. Brawl, though Lucas' appearance would be based on Mother 3's eventual Game Boy Advance release as opposed to what is now commonly referred to in the fan community as "EarthBound 64".

The characters of Captain Falcon, Pichu, Ganondorf, Peach, Jigglypuff, Link, Samus, and Donkey Kong actually have two taunts; one for each direction they are facing (right or left). However, some characters like Donkey Kong, Samus, and Ganondorf have taunts that look identical but actually have very subtle differences that are hard to spot at first glance.

Before his career took off as an indie developer, Toby Fox used to play Super Smash Bros. Melee competitively under the old username 'Radiation'.

He is currently the only known competitive Super Smash Bros. player to have a character he has created represented in the series. Alongside the release of Banjo & Kazooie as a fighter, a Mii costume based on Sans from his game Undertale as well as an original remix of the song "Megalovania" were both added to Super Smash Bros. Ultimate on September 4th.

The trophy representing Meowth in Super Smash Bros. Melee is a reference to his appearance in a tech demo shown off at Spaceworld 2000 called "Meowth's Party", which itself was based on a recurring ending musical number from the Pokémon anime. In his trophy he is holding the same red guitar that he performs with in the tech demo. The flavor text for his trophy even directly mentions this tech demo:


A version of Meowth's Party eventually made its way into the GameCube release of Pokémon Channel.