The manual states in its controls that only the B button can be used to confirm selections on menu screens, but in the game it also works with the A button that the manual fails to mention.
In the level Forest Secret Area, if the player lands on either of the two Flying Platforms, the background scrolls from right to left continuously for no reason, even after the player reaches the Giant Gate from the cliff far across the abyss.
If you defeat a boss or win the game with Luigi, Mario's name is in the narrations and not Luigi's.
The artwork depicting Special Zone and based upon the level Awesome that is one of the world's said levels, all but one of the different types of enemies are present in the level in the game: the fish enemies shown in the artwork are Blurps, but the actual fish enemies in the game that appear in the level are Cheep-Cheeps.
Urchins, a type of enemy appear only in the level Forest of Illusion 2 that takes place underwater in a vast lake. In real life, urchins in general only live in oceans.
The enemy Dino-Torch that is a miniature version of a Dino-Rhino (especially after bouncing on the latter) is referred to in the manual as "Mini-Rhino".
The Porcu-Puffer enemy that appears in a few levels with the water surface has yellow lips in the promotional artwork; but has magenta lips in the game.