In the European version, there is an extra language called "Lylat", a made up language which is similar to the gibberish spoken in the original Star Fox.

The game's opening features the phrase "Star Fox in Nintendo 64". This was a translation error and is supposed to read "Star Fox on Nintendo 64". This was fixed in the 3DS remake.

In the Japanese Versions of the game, after being shot down one of Fox's Teammates will shout out his name, similar to Star Fox Assault, but in the Western Versions, they instead shout "No!!!".

One of Peppy's most well known lines, "Never give up. Trust your instincts.", was added because Takaya Imamura had requested the game's script writer, Mitsuhiro Takano, to include a stock phrase heard commonly in sci-fi movies. Takano then struggled to play Star Fox 64 as he kept getting hit and failed to make any progress, but as he was thinking of giving it another shot, that line popped into his head.

The green planet Peppy's Arwing is shown hurdling towards in the prologue for Star Fox 64 (and also its 3DS remake, Star Fox 64 3D) is actually meant to represent Papetoon, his and also Fox and James' home planet. The Japanese prologue even refers to it as such, and various Japanese SF64 material also mention it. However, when Star Fox 64 was localized for Western audiences, Nintendo of America completely wiped out all specific mention of Papetoon in both the prologue and also manuals/guidebooks.

The Star Fox 64 Official Player's Guide gives Aquas' boss Bacoon a very different backstory from the official Japanese guidebook. The latter says that Bacoon is simply just a bioweapon made by Andross, but the former gives it a more elaborate background, claiming that it was an ancient monster that was jealous of the ancient civilization and their temples/islands above the ocean's surface, and overtime it learned how to control the other aquatic lifeforms within Aquas' oceans, such as the explosive Starfish, which were then commanded by Bacoon to migrate to the ice cap and detonate, resulting in the polar cap being melted and all of the islands submerged into the sea forever, essentially explaining the ancient undersea ruins throughout the Aquas stage.

On the Japanese website for Star Fox 64, Slippy mentions certain background characters who would appear in future installments:

• Peppy's wife, Vivian Hare. According to Slippy, Peppy took her to planet Zoness for their honeymoon, which explains why Peppy is so distraught at its polluted status in SF64. Vivian would appear in-game for the first time in Star Fox Command, where it's revealed that she and Peppy had a daughter named Lucy, and that Vivian had died of a disease several years prior.

• Slippy's father, Beltino Toad. According to Slippy, Beltino works as an engineer for Space Dynamics, the manufacturer of the Arwing and many of the other vehicles the Star Fox team utilize. Beltino would later appear in-game for the first time in Star Fox Assault, and would later appear in Star Fox Command.

It's worth pointing that unlike Vivian, Beltino was mentioned in western ancillary SF64 material, that being both the official western Star Fox 64 website and the Star Fox 64 Official Player's Guide, where it states that he helped his son Slippy create the Blue Marine.

Katt Monroe, a female feline character who first appeared in Star Fox 64, had undergone a notable change in appearance from that game going into Star Fox Command, most notably now having black fur instead of pink. According to Takaya Imamura in a 2011 Nintendo Dream magazine interview, he changed her appearance to be more "fashionable".

Prior to Star Fox Zero, there were two attempts in previous installments to revitalize the concept of the Walker from Star Fox 2, or at least the idea of the Arwing transforming into a robot form, those specifically being Star Fox 64 and Star Fox Command, games that both aimed at preserving ideas from the then-long-lost Star Fox 2.

• For Star Fox 64, according to Shigeru Miyamoto in an interview at the end of the Star Fox 64 Official Player's Guide, he wanted to have the Arwing transform into "a human-type craft". This was rejected by other staff members of the SF64 development team. In response, Miyamoto told his team to come up with better ideas, and from there they created the Landmaster and Blue Marine for additional vehicles.

• For Star Fox Command, according to Takaya Imamura in an interview in 2007, the dev team experimented with having the Arwing and other spacecraft transform into robots, but this was ultimately dropped.

Prior to his days as Star Fox's ace pilot, Falco Lombardi was originally a member of a space gang known as "FREE AS A BIRD". Katt Monroe was part of this gang as well. In a 2011 Nintendo Dream interview, Takaya Imamura revealed that when Fox was forming his new Star Fox team in the wake of James' death, he heard stories about how good a pilot Falco was as apart of FREE AS A BIRD, and visited him multiple times to try to convince him to join his new team, as he wanted to have an experienced partner due to still being unsure of himself as a leader.

Though originally mentioned in the background lore for the Japanese version of Star Fox 64, FREE AS A BIRD in its entirety would physically appear in "Farewell Beloved Falco", a canonical manga interquel set between Star Fox 64 and Star Fox Adventures that was never localized outside of Japan.

The name "FREE AS A BIRD" is a reference to the song of the same name composed by English rock band The Beatles. This adds up as both Takaya Imamura and Shigeru Miyamoto were reportedly big fans of the band, with General Pepper's design and name also being a reference to their album "Sgt. Pepper's Lonely Hearts Club Band".

According to the official Japanese guidebooks for both Star Fox 64 and Star Fox Command, Meteo (or "Asteroid Belt" as it's referred to in Command) is said to represent remnants of a destroyed fifth planet from the early days of the Lylat System, which aligns with its close proximity to Corneria, the fourth planet of the Lylat System. It is said that many of the asteroids there contain highly pure metals, and their outer edges have been the site of high-quality mineral deposits, though ultimately what lies in the deepest parts of the asteroids remains unknown.

This information would also appear on the official western Star Fox 64 website and also in the Star Fox 64 Official Player's Guide, though strangely enough, the latter states that Meteo is believed to be the remnants of a ninth planet from the early days of Lylat.

According to the official Japanese Star Fox 64 guidebook, Area 6 was originally a space farm or plantation before Andross' army invaded and turned it into a military base for their forces.

The official Japanese Star Fox 64 guidebook reveals that Pigma Dengar, who became a subordinate of Andross, was effectively the real mastermind behind the creation of Star Wolf: he goated and manipulated Wolf into becoming its leader and also working for Andross as a means to combat the newly formed Star Fox team led by Fox McCloud, taking advantage of Wolf's supposed honorable, "magnaimous" side and also his prior rivalry with Fox's father, James McCloud. It is said that he manipulates the entire team behind the scenes in accordance to Andross' orders. It also reveals that Pigma had already been working underneath Andross during his time as a researcher at the Corneria Defense Force Scientific Research Institute. It's also revealed that both Pigma and Andross had custom engineered the Wolfens that the Star Wolf team utilize in their battles against the Star Fox team's Arwings.

In Super Smash Bros. 4, the trophies for Pigma and the Wolfen would reiterate this information, as would the official guidebook for Star Fox Command. The Star Fox 64 Official Player's Guide would similarly allude to Pigma being the root cause of Fox and Wolf's rivalry, claiming that, without his influence, perhaps they could have been friends in another timeline.

At the beginning of Star Fox: Assault, Andrew Oikonny's rebellion is seen to be utilizing three models of humanoid mechas, which, going by the official Japanese guidebook for Star Fox: Assault, seem to be known as サルデス (Sarudesu). This can be transliterated as "Sardes".

• サルデス MK III S (this seems to be a prototype, judging by Fox's comments. It later appears infected by the Aparoids.)
• サルデス MK III DB
• サルデス MK III DG

These are actually meant to represent evolved forms of the Shogun Warriors featured near the end of Star Fox 64's Sector Y stage, who too in the Japanese version of SF64 are referred to as サルデス (Sarudesu). What is called the Shogun Lord in the English version of the game is also called サルデスII (Sarudesu II) in the Japanese version.

As サル (Saru) is the Japanese word for monkey, and デス (Desu) means death, the literal translation of the name in English should be "Monkey Death".

The boss on Solar known as Vulcain, alternatively known as サンガー (Sangā) or Sanger in the Japanese version of Star Fox 64, was originally intended to be the boss for Sector X.

A developer story on the Japanese website for Star Fox 64 reveals Sector X was originally meant to be the "Andross Army Biological Weapon Development Factory", and Fox and his crew were supposed to have engaged with a transport fleet heading for the factory, where they would sneak past the security defenses and enter the interior of the factory, only to find it in a state of disarray due to an accident during an experiment with robots and out-of-control bioweapons attacking all over. They would eventually come across an enemy transport ship attempting to escape only for it to be suddenly destroyed from the inside, revealing Vulcain as the stage's boss.

In the final game, Spyborg (HVC-09 in the Japanese version) is the boss of Sector X, and Vulcain was relocated to planet Solar. Vulcain's beta textures from its tenure as the Sector X boss was recently discovered within files pertaining to Star Fox 64 in the Nintendo Gigaleak.

Contrary to popular belief, and also contrary to the Star Fox 64 Official Player's Guide, Solar is not a star, but merely a lava planet with an exposed mantle, according to both the official Japanese guidebooks for Star Fox 64 and Star Fox Command. Even the official Western Star Fox 64 website clarifies it being a planet. The Western localization of Star Fox Command would also reiterate this in-game, with one of its missions on Solar being named "The Red-Hot Planet".

In a 2011 Nintendo Dream magazine interview with the Star Fox 64 3D development staff, Takaya Imamura once again clarified that Solar is a planet, and that the star Lylat exists somewhere in the Lylat System not visible on the map screen. Apparently, the development team did consider changing Solar into being a sun for Star Fox 64 3D, but this was passed over.

Star Fox, Star Fox 64 and Star Fox Adventures are the only Star Fox titles to provide official ages for the main characters, primarily within their Japanese ancillary material. In the Original Soundtrack box released for the first game, Fox, Falco, Peppy and Slippy are said to be 25, 28, 36 and 19 respectively. Star Fox 64, being a remake of the first game, would retcon these ages and make Fox 18, Falco 19, Peppy 41 and Slippy 18.

The "Farewell Beloved Falco" midquel manga, which is set right in the middle of the eight years between Star Fox 64 and Star Fox Adventures, also gives the original Star Fox crew ages, with Fox now being 22, Slippy 22, Falco 23, and Peppy 45.

Star Fox Adventures takes place eight years after Star Fox 64, which means that Fox is now 26, Falco 27, Peppy 49 and Slippy 26. Japanese Star Fox Adventures ancillary material also reveals Krystal's age to be 19, making her distinctly the only Star Fox character outside of the original four Star Fox members to have a known age. Going by this, she would be 11 and 15 years old during the events of Star Fox 64 and Farewell Beloved Falco, respectively.

After Adventures' release, Nintendo, specifically Takaya Imamura, made a deliberate decision for future Star Fox games to not provide any official age numbers for any of the characters. However, Star Fox Assault officially is said to take place only year after the events of Star Fox Adventures, so this would make Fox 27, Falco 28, Peppy 50, Slippy 27, and Krystal 20. Similarly, according to Takaya Imamura in a 2007 interview, Star Fox Command takes place 2-3 years after Assault, which would make Fox 29-30, Falco 30-31, Peppy 52-53, Slippy 29-30, and Krystal 22-23.

Although Wolf O'Donnell has never had any age officially listed for him, Takaya Imamura implied on Twitter that he is within the same generation of Peppy and James.

One of Falco Lombardi's most famous lines in Star Fox 64 is "Hey, Einstein! I'm on your side!"

This line is somewhat controversial because it implies that there exists some version of scientist Albert Einstein within the Star Fox universe. It is worth pointing out that this was added in for the Western localization of Star Fox 64, as in the Japanese version of the game, Falco simply just says:


Ultimately, the Western version of Star Fox 64 3D would have this line be changed to: "Hey, genius! I'm on your side!"

According to former Nintendo character designer Takaya Imamura, Wolf O'Donnell was inspired by his grandfather, who he described as being a "bad man".

One of the more enigmatic characters in Star Fox 64 is the tanuki or raccoon dog that only appears in its training mode. On the official Japanese Star Fox 64 website, Slippy reveals that his name is ヤル・デ・ポン (Yaru De Pon), and that he is the president of Space Dynamics, the manufacturers of the Arwing and other vehicles the Star Fox team utilizes in their missions.

His surname seems to reference the du Pont family (ポン spells both "Pon" and "Pont"), a wealthy American family who made their fortune selling gunpowder, and later chemicals and motor vehicles. A popular rumor is that Henry A. du Pont secretly sold gunpowder to the Confederacy during the Civil War; fittingly enough, Slippy implies that Yaru de Pon is involved in "shady weapon deals", suggesting that he might be supplying Andross' forces as well.

Yaru de Pon is also notably the only character in the original Star Fox 64 to not have any voice acting. This was addressed in its 3DS remake, Star Fox 64 3D, where he is now properly voiced by Jay Ward (who also voices Wolf O'Donnell in Super Smash Bros. Brawl and Super Smash Bros. Ultimate, as well as the Nintendo Switch version of Starlink: Battle for Atlas) in the English version, and Kunpei Sakamoto in the Japanese version.