List of New Super Mario Bros. Wii pre-release and unused content

Beta Elements from the game New Super Mario Bros. Wii.

Propeller Mushroom
The orange Propeller Mushroom was originally a Propeller Suit, a red letter "P"-like suit with a propeller at its top. It's unknown why the creators changed it into a Mushroom.

Level Designs
Many of the platforms were redesigned as many of them were originally plain in color. There are also differences in mechanics of some of the platforms. There was earlier going to be platforms moving on their own, close by growing and shrinking pipes, but those platforms can now be controlled by players doing something specific. For example, World 1-1 had the first Star Coin in the level on the overworld part of the level, the underground area with the second Star Coin was made differently, and the Red Coins and Red Rings were absent; they were replaced by Coins. World 7-5 and 5-3 both had World 1's background.

Fire Toads
Originally the fire Toads had caps which had their respective colors reversed with white spots on them. In the latest screens from the games, the Toads instead have red spots on their caps.

HUD during gameplay
During the early screenshots of the game, the HUD originally appeared transparent during gameplay; additionally, the text appeared very different, with only generic font; possibly as a placeholder. Recent screenshots and videos of the final build show that the HUD is now solid (only turning transparent if a player goes behind it), certain icons were updated or brightened up, and along with the trademark Mario text. Notably, the life box was sized down, while the score and timer stretched out slightly.

Also, when a Yoshi is ridden, a music note appears on the upper-right side of the screen. This may have been deleted because that people may have been under the impression that the note stands there for no reason.

Red Yoshi
While the game was still in development, Nintendo confirmed that a Red Yoshi is ridable (even artwork has been made, saying that it would stay so). However, after a newer trailer, Red Yoshis haven't been seen again in this game, but instead, Pink Yoshis have been added (the artwork for the Red Yoshi has changed to match the current change).

Blue Yoshi
The Blue Yoshi was also supposed to be in New Super Mario Bros. Wii ever since the gameplay, a Blue Yoshi is ridable and was confirmed. In the final version, they are replaced by the Cyan Yoshis.

"Level Clear!"
In the E3 2009 demo, whenever a character completes a stage, the message "Level Clear!" appears. It has since changed to "Course Clear!" for unknown reasons.

Sound Effects
During the E3 2009 demo, the coins had 8-bit sound effects, just as they did in the first New Super Mario Bros., but that was later replaced with most recent coin sound effects.

Also, the power-up sound effect was originally the recent sound effect like in New Super Mario Bros., but it was changed to the 8-bit version.

Dropping in on the Koopalings
In the E3 2009 demo, after players go through the boss door, they all fall from the top of the screen and into the boss room, as the initial Larry and Morton videos showed. This was just like in the original New Super Mario Bros., where the player also enters the Bowser Jr. battles the same way. In the final version, the players are already on the ground when the boss room loads up.

Boss Changes
In the first battle against Larry Koopa as presented in the E3 2009 demo, whenever he goes into his shell, he barely covers any ground. Also, the first battle with Morton was held in the World 1 Castle in the demo, not the World 6 Tower (as that level wasn't featured in the demo). Morton also doesn't have spiked pillars stabbing the platforms to the side; instead, there are Podoboos jumping out of the lava.

Flag and Midway flag
The flag and the midway checkpoint were originally going to have an image of a skull on it, but it changed to Bowser's face in the final version.

Power Up Panels
In the final game, the "Your Turn" message does not appear in single player mode.

Penguin Suit
The Penguin Suit was going to have white eyes with a blue pupil but changed with Black Eyes.

Enemy Changes
The Bramballs in the E3 trailer had brown feet instead of yellow feet.

Level Music
The underground, desert, castle, and athletic themes were not remixed. , as well as the flag song. The snow, forest, and lava music did not exist at that time.

Unused Enemies
Information for a Giant Buzzy Beetle exists within the game. However, it wasn't used in any level. The Giant Buzzy Beetle can be used as a platform, and will only move continuously in one direction; it does not fall while airborne. It does, however, change direction when it hits walls or collides with certain enemies. Lastly, it is immune to every known attack method, including invincibility. On a side note, this enemy's movement speed can be adjusted with the program, Reggie!.

It is also likely that Fishin' Boo was intended to be in the game at one stage, since an unnamed object is called 'EN_GHOST_JUGEM'.

Unused Platforms
There were unused platforms. These include four rotating platforms (similar to the ones during the Reznor battle from Super Mario World), see-saw, and controllable platforms like the ones from 1-2 and 7-2 in New Super Mario Bros., respectively, and trampoline platforms that bounce the player to the opposite direction. These platforms were simply long gray blocks.

Objects from the Prequel
Objects from New Super Mario Bros. were about to be used in the game, but then was canceled. These include the one-way gate from 2-3, moving gray platforms from several castle levels, and swinging pendulum platforms from 4-Castle.

Gray ? Blocks
In the E3 version, it was shwon that there were originally going to be gray ? Blocks in the ice levels, but were scrapped out for unknown reasons.

Event Switch
In the level editor Reggie, it is possible to find a magenta ! Switch, and even a Brick with it. This ! Switch is an Event Switch. The Event Switch allows an event to activate one of up to four event IDs specified and do something else.

Unused Power-up
While never revealed or used in the game, a power-up that appears to be a chicken suit was originally intended to be the game. Concept art of the suit had been discovered though it's purpose or effects on the characters using it is unknown.

Results Screen
In demos shown in the Press Conference, after finishing each level a results screen would pop-up showing the player how many enemies were stomped and how many coins were collected.

External References
Nsmbwii testing, Beta stuff etc. NSMBWii - Unused/Beta stuff