The American cover for this game has been ridiculed for having no resemblance to the game at all. Gamespy has placed it as number 1 for the Top Ten Worst Covers list.
The manual claims that you can crouch by pressing down, but Mega Man can not duck in this or any subsequent game.
This game has been remade five times, that's more than any other game in the Megaman series.
One of the concepts in the game by the creator Keiji Inafune, was a rock, paper, scissors concept in showing that every every weapon and Robot Master has a strength and a weakness.
The original Megaman game has a huge amount of significant differences between all its sequels, especially around boss battles:
- It is the only Megaman game where you have score points (since you don't get extra lives when the score increase as in most games, the score is totally useless).
- It is the only Megaman game where you have 6 robots to fight instead of 8.
- The word "Ready" doesn't blink when you start a stage.
- You sometimes enter to the boss room from the top (Bomban stage, Dr Willy stage 2) or from the bottom (Elecman stage). In all other Megaman games, you always enter from the left.
- When approaching boss rooms, instead of having one gate that opens and one gate that close, there is one double-gate that opens and it doesn't close after you enter.
- You have enemies between the last gate and the boss. This allow the possibility to loose life before actually beginning the battle, and add some challenge.
- When entering in boss room, first the music start and the bosses lifebar show up, then the gate closes.
- When the boss is defeated, it doesn't make the same noise as if Megaman is defeated.
- After the boss is defeated, you have to take a ball to exit the level.
- After that, you don't get a bonus screen or anything. Your bonuses pops up directly on the screen.
One of the bosses in the game that utilizes rocks as a weapon Gutsman -- not Rockman -- due to the original Japanese name for Mega Man. In Japan, "guts" is a phrase commonly associated with strength and vigor.
The Yellow Devil(who's in the first Wily stage) was renamed the "Rock Monster" for the original U.S. release of Mega Man(this also applies to Mega Man 3). The reason behind this was Nintendo of America's being squeamish about the use of the word "Devil" in its games. The PS2 and Xbox versions of Mega Man Anniversary Collection(also Megaman 2: The Power Fighters), however, refers to the Yellow Devil by its original name.
Mega Man made his first and regular animated appearance in the Saturday morning TV cartoon "Captain N: The Game Master". He later had his own animated series and a comic book.
When Capcom was producing this game, there were several names considered for the main character. Knuckles Kid was one suggestion, as was Rainbow Man (because the main character changed colors whenever he used a different weapon). They finally went with the name Rockman, which was changed to Mega Man when the game was released in the United States and Europe.
Mega Man is invincible for a few moments after he takes damage, but this invincibility does not apply toward spikes, unlike in the later games.
Water does not make Mega Man buoyant here (he doesn't jump any higher underwater than on dry land). Again, this is the only game in the series that has this.
When you revisit a stage, the Robot Master at the end will be back, whereas the games that followed had the room empty when you revisit the stage.
There is a pause function in the game (press SELECT) that also has an interesting bug with it: damage from shots can be applied over and over by rapidly pausing and unpausing the game when an enemy is hit with a special weapon (such as Elecman's Electric Thunder). The pause feature (and the bug) were removed in the next games in the series.
This is the only entry in the series that doesn't tell you the names of the weapons you acquire (though subsequent re-releases such as The Wily Wars on the Sega Genesis give the names).
This entry in the series is the only one to keep score (apart from Mega Man Soccer).