In the July 2020 Gigaleak, two pictures were found among early graphics used for F-Zero X of the head of a 1998 Moore Action Collectibles toy of Beavis from the animated series "Beavis and Butt-Head". The second picture is an enlarged version of the first with inverted colors.
The music track called "Big Foot" features an opening that is identical to the opening to "At Doom's Gate" from Doom.
In the Virtual Console version of the game, there's a fault that causes textures to appear differently. This is most noticeable in Sand Ocean 1, where there's a bright section of pipes not seen originally.
Attaching the DD expansion kit to the Nintendo 64 console will make the game play a different track on the Rainbow Road level; an arrangement of the Mario Kart 64 Rainbow Road music.
The game was released 3 months late in the U.S. due to Nintendo's policy of attempting to release first party Nintendo games evenly spaced out throughout the year.
The first track of the Joker Cup is Rainbow Road. It is a replica of Rainbow Road for Mario Kart 64, with some elements altered to fit in the style of F-Zero X.
The music was compressed down to monaural to save space, with ambient sound effects being used to produce a stereo experience.
An expansion kit was released in Japan for the game to be used with the Nintendo 64DD. Players could create custom tracks, custom vehicles and it featured a new improved soundtrack and access to new cups and new vehicles: the Super Falcon, Super Stingray and Super Cat. Even though it wasn't released outside of Japan due to the commercial failure of the Disk Drive, the expansion's data can still be found in the game's files.
There is an unused vehicle named "Super Falcon", it is only accessible by using cheat codes. It was originally intended to become unlocked with use of the F-Zero X Expansion Kit for the Nintendo 64DD.
F-Zero X was the first racing game to run at 60 frames per second. To achieve this however, the polygon counts of the vehicles and the detail of the tracks had to be limited.
When Baba falls off of a course, his scream is that of a female driver, and not of a male driver. In future F-Zero ephemera (most prominently in the Japanese version of F-Zero GX and the F-Zero: GP Legend anime), Baba is depicted with more effeminate qualities.