Revealing mistake: The diary page you retrieve while Saori is unconscious with the Crow knight still in the stadium has just the same sentence repeated over and over.
Other mistake: When you get connection problems, the pop-up message telling you that says "Sorry, the sanctuary is BURY, please try again later."
Character mistake: When the knight of the Crow is surprised by Saori's manifestation as Athena, he says "Why does this woman has such a..."
Other mistake: The standard attack of Unicorn Jabu is a spinning hook kick. The name of the movie in the menu is Unicorn Kick, and the voice actor even screams it; "Unicorn kikku." So, of course, the pop-up text that appears when the blow connects is..."Unicorn Fist." It's a kick.
Other mistake: Multiple times during the game the key event ("prize fighting", as it is sometimes referred to in a derogatory way) organized by Saori Kido is called "Galactic War", "Galactic Duel", "Galaxian War", with no uniformity in translation.
Other mistake: The intro screen for Chapter 8 says "To their surprise, the ones greeted them were killers." The title is also "12 Zodiac Palace", where it should be Palaces, or Temples.
Character mistake: In the cutscene with Seiya unconscious during the beating he takes at the house of Aldebaran, the letter S is sorely missing when Marin says "If he take out his sword" and Mu says "Gold Saint have all learned."
Audio problem: The lengthy tutorial for the game is carried through by the character Kiki, Mr. Mu's aide. The text balloons are mostly fine, but each line is also dubbed, in a language that tries really hard to be English, but is obviously read by a non-native speaker and butchered to the point of being barely if at all intelligible.
Other mistake: In the cutscene at the end of chapter 4, it is said that Ikki was hit by "This own technique", instead of "his own technique."
Character mistake: The in-fight taunt of Black Andromeda says "These chains will turn into snakes that will drain your HP." Nothing of the sorts happens in the game - no snake related effects or appearance, and most importantly, it's not an attack with a HP drain effect.
Character mistake: When Milo speaks with Crystal in Story mode about his master, he says; "If he hasn't done so, you probably have already died long before." That's not how conditional forms work.
Other mistake: In the summon screen, there is no translation for a constellation. Literally; look around and you will find one mislabelled with; No Translation.
Other mistake: In the opening story of the Divine Cloth Shiryu event, Shiryu calls his son "Ryuho", but when he answers, the name in the box is "Shoryu." It keeps going back and forth during the dialogue.
Other mistake: Completing the quest "Have 50 Friends, send 3,000 hearts" gives you a perk that is called "Celebrity I" in the mission report, and "Well Known I" in the trophy showcase.
Other mistake: The name of Virgo's sidestory is "Ten Trillion worlds apart", as it shows in the quest list and in the in-game story, but in several other parts of the game it appears as simply "Trillion worlds apart"
Factual error: In Chapter 11-2 a vulture is assigned as noise a howling (its speech balloon says " ^Howls^ ").