Character mistake: The screen showing the cemetery inside Arzenal is full of tombs with utter gibberish names (like Tsliap Stliow, who died in GXVI, apparently, whatever year G is) - Some of this creative engraving does not even fall in the proper physical boundaries of the stone. And it's also labeled "CemetAry."
Character mistake: Sousuke Sagara's profile says that he does not care for the Arbalest or "it's AI." Should be its, possessive.
Character mistake: Kiryuu Mikage's bio says that her father was "a soldier from the Space CALVARY", instead of cavalry.
Character mistake: Fighting against the Yamato, Schultz might say "Terron monkeys! How did they build a faster than a light speed spacecraft?" One "a" too many.
Other mistake: In the dispatch mission "A Life's Vow", Tobia teams up with a federation soldier, called "Federation soldier." One of his lines says "I know the visor's kinda in the way, but I've got red eyes." But we can see his eyes perfectly fine, and they are not red, not even a tinge! There are many other times when the game has overlays / alternative versions of portraits, this is kinda egregious of a miss.
Character mistake: During Scenario 12 "The Dispeller of Chaos", Sumeragi makes her first appearance in the game botching her very first line as she says "I am IMPRESESED you've actually MAKE yourself a decoy."
Character mistake: A few times during the game (for instance in Haruki's biography) the expression "Coup d'état " is not visualized correctly, with the accented letter replaced by a dot.
Character mistake: One of Jamie's lines against the Para-mails is "Even a beautiful machine can be spoilt when a harlot is at the controls." She says that line even against Tusk's, the one (unambiguosly) male pilot of that kind of vehicle.
Character mistake: One of the possible lines the AI units have facing Getter Robot is "Confirming unit that uses Getter Rays." It's the other way around; 'confirming THAT (the) unit uses Getter Rays'.
Other mistake: The profile of commander Okita misses a space when his education is mentioned ("Healso holds a doctorate").
Other mistake: During scenario 36 ("Who Inherits the Stars"), Kamille has a scripted battle against Jerid that prompts the activation of the Bio Sensor animation, even if the player already managed to trigger it.
Plot hole: When Shoji gives himself up to the authorities at the end of mission 9, Aoki thanks to the Senpuji Industries lies to the inspector saying that he was a test pilot, but that does not solve the not marginal issue that the playing character comes from another dimension and has no ID. The inspector is a stickler for the rules but in all the hours of interrogation apparently the subject of their identity never came up.
Other mistake: Upon facing AI enemies, one of Tobias' possible opening quotes is "I'm fighting a machine. I just need to read it's patterns." Should be "its".
Character mistake: Facing Exev in his Imperial (for instance during mission 45), you are very likely to get as one of his messages "Darkness opens it's mouth to consume you", with a bad grammar mistake.
Character mistake: During mission 48, " Lost and Bound", some pilots have a personalized message if they engage ELS units for the first time. Ange's says "if there's a way out of this that DOENS'T involve fighting", with a typo.
Character mistake: Facing enemies from the Invaders/Getter ray infected faction, Go has as opening line "You don't under the meaning of evolution", missing a rather important part of the word "understand."
Other mistake: During the mission on the capital of the Gamila empire (Scenario 49: Closing the Books), when Soji (if he's your main character) receives his robot back, he says "The accelaration on this is great now...", with poor quality control for the typo (should be "acceleration").
Other mistake: During the game the word "Naive" is used somewhat frequently and spelled two different ways; one is with a normal letter " I " that creates no issues whatsoever, the other is with a different spelling (probably with the I with diaeresis, " ï ") that may not be visualized correctly, as several times (such as in one of the dodge quotes by Ryoko or in cutscenes) it appears as Na·ve. There's no reason why there should not be a consistent way to spell it, anyway.
Other mistake: Koji Kabuto's phrase attacking characters with shields such as the Lambda Driver or Distortion Field is "Mazinger's power can smash through an barrier", with an obvious misuse of 'an' in front of a (n) consonant.
Character mistake: In the tactical briefing between mission 41 and 42, the heroes discuss what happened and deal with Yurisha. Sanada refers to previous incident that allowed her to manifest as "our enemy's psychological attack", while obviously it was a "psychic" attack.