Unused content (SSBM)
Masahiro Sakurai answered fan questions in a questionnaire on the original Super Smash Bros. website, with some of them regarding the inclusion and exclusion of particularly popular characters.
Sakurai's statements regarding Banjo and James Bond have led to a rumor that they were actually considered for inclusion, but he didn't actually say this.
A mysterious character named NONE can be accessed solely through the game’s debug menu, and crashes the game when attempting to start a match with it. NONE can be used in the results screen, however, where the nametag cycles through all of the characters before landing on Sheik, and then cycling through the team colors before showing NO CONTEST and crashing. NONE’s intended use is unknown, however it was most likely for debugging purposes.
The game initially had only 10 starter stages, one for each of the default character universes except for Ice Climber: Princess Peach's Castle, Kongo Jungle, Great Bay, Brinstar, Yoshi's Story, Fountain of Dreams, Corneria, Pokémon Stadium, Mute City, and Onett.
A number of stages still have leftover data in Melee, though they can only be accessed through use of the debug menu.
Some Bonuses were left out of the final game, though they can be accessed with an Action Replay. The reason for their removal is unknown.
The original boxart depicted Mario getting attacked by Bowser with his Fire Breath instead of showing Mario, Bowser, Link, and Pikachu fighting. The lighting on Hyrule Temple was also considerably brighter. While unused for the final game, this box art was used for some of the game's early promotional material, such as websites accepting orders for the game, and some print advertisements and retail catalogs.