There are two audio files of the Cheshire Cat meant for the end of the game, Spoiler: talking about the death of the Red Queen. However, both clips are unused in the final game.

Alice's screams for death by burning and death by falling into a pit are both shortened versions of longer voice clips. The full recordings are in the game's files, but go unused.

There are unused versions of the Red Queen's speech, in which her voice is slowed down. This audio was not replicated for any of the alternate language dubs.

There are four unused voice files of Alice saying her own name. Their placement in the files suggests they were meant to be said at the end of the game. In the French, Spanish, and German dubs, only one take exists.

After the fight with Centipede, before Alice eats the toadstool to return to her normal size, she will say "I wish I were hallucinating. What a horrible choice. Eat a toadstool or remain food for insects."

There is an unused take in the game's files that features a slightly different ending. "I wish I were hallucinating. What a horrible choice. Eat a toadstool or become a meal for insects."

This unused take, while it is in English, does not appear in the English dub's files, only being present in the files for the Spanish and German dubs.

When the game's soundtrack was released, composer Chris Vrenna added lines from the game to every song. This was done as a method of retelling the game's story through audio alone.

Notably, some lines used on the soundtrack (such as the line used in the song "A Happy Ending") actually went unused in the final game.

The game's official soundtrack contains songs not found in the game. According to the game's composer, Chris Vrenna, he actually composed many more songs had been required for the game, and he decided to release all the unused songs alongside the used songs on the game's official soundtrack.

When the game was released in Japan, the game's name was changed to "American McGee's Alice in Nightmare" as a play on Alice in Wonderland.

The Save/Load screen features the brand "Bandersnatch Opticals" on it. This brand is named after the Bandersnatch, a creature featured in Lewis Carroll's "Through the Looking-Glass, and What Alice Found There", specifically the piece "Jabberwocky".

In order to accurately capture the Victorian era, composer Chris Vrenna disallowed himself from using modern instruments.

The soundtrack was largely composed using instruments of the time, such as zithers and autoharps, toy instruments, and various children's toys, such as jack-in-the-boxes. Ambient noise and strings were then added to the songs to give the songs a more creepy feeling.

In order to make the music more organic sounding, Vrenna built the rhythms of the songs based on various environmental samples such as clock ticking, ratchet noises, and door slams.

There is a different version of part of the Red Queen's speech to Alice in the game's files. This version uses the Red Queen's normal voice, as opposed to the distorted, deeper voice featured in the final game.

According to concept art, Alice's dress was to feature the symbol of Ceres as opposed to the symbol of Venus as seen in the final game.

A console port of the game was planned but never came out. This is most likely due to the closure of Rogue Entertainment in 2001.

The game wouldn't see a console release until 11 years after it's release, when it was released for Playstation 3 and Xbox 360 as a extra included in the sequel, Alice: Madness Returns.

When talking to Turtle at the beginning of the level "Dry Landing", Alice will say "I'm not on holiday."

This line was originally meant to be "I'm no bloody tourist!". This unused line was recorded, and can be found in the game's files.

There are eight takes of the Red Queen saying "Off with her head" in the game's files. Only one take is ever used in the final game, meaning that the other seven takes go unused.

There's an unused alternate version of the game's ending theme called "finale_bad.wav" in the game's files. This implies that at one point, the game was to feature multiple endings.

This game was the first M rated game published by EA. According to American McGee, he fought for the rating because he didn't want parents to buy the game thinking it was for children.

In retrospect, McGee stated he regretted fighting for such a high rating, believing the game wasn't violent enough to warrant it.

In the console versions of the 2011 rerelease, the main menu and loading screens are rendered in 4:3, as opposed to 16:9 like the rest of the game. As such, they feature a border. This border is not featured in the PC version of the rerelease, since the main menu and loading screens are rendered in 16:9 like the rest of the game. However, the border is still in the PC version's files as "border1_left.tga".

Similarly, the console versions also feature a title screen, which goes unused in the PC version since neither the 2000 original or the 2011 version have a title screen. This is also in the PC versions files, as "title_bg.tga".

In one of the cutscenes in the game, Alice will say the line "I shouldn't think so. I'm a person, and just now I wish to become very small. About this big." However, there is a different take of the line in the game's files that goes "I shouldn't think so. I'm a girl, and just now I wish to become very small. About this big.", replacing the word 'person' with 'girl.'

Both the original release and the 2011 rerelease use the version with "person" in it, so this different take goes unused.

The symbols on Alice's dress have changed throughout promotional artwork and the several releases of the game.

In original promotional artwork, the symbols are the symbol of Neptune and the symbol of Jupiter. In game, the symbols are the symbol of Venus rotated 45 degrees to the left, and a sextile.

In the 2011 rerelease of the game, the symbols are the symbol of Eris, and the symbol of Jupiter. This makes the design fall in line with its appearance in the sequel, Alice: Madness Returns.

When American McGee was asked about the symbols he said "the difference in symbols might have to do with poor communication/planning and/or might have to do with the marketing department being overly sensitive about the symbols and their meanings. Too much time has passed for me to remember exactly what caused the differences."