When the game was still in production, Nintendo Power published some mid-production photos of the introduction stage at the beginning of the game. These photos featured a futuristic cityscape background that was not in the final version of the game, as well as enemies not from the intro stage.
Only Mega Man X game in which X doesn't start the game with a Dash ability.
All eight Maverick levels have a hidden heart tank. A sub tank is hidden in four of them.
The only characters from the original Mega Man series to appear here are Hard Hats, Batton Bats, and Dr. Light (in hologram form.)
As an added Easter Egg in the game, Capcom included the ability to get Ryu from Street Fighter's fireball technique.