Character mistake: When trying to decipher what the letters from the dermal implants spell, Lucifer rearranges the letters and says "Hilii Fircus, it means 'children of the goat.'" However, the correct phrase was Filii Hircus, not Hilii Fircus. (00:13:27)
Sweet Kicks - S1-E5
Character mistake: Benny tells Lucifer he's an ex-marine. I beleive it's the case that US Marines never refer to themselves as an ex-marine, with the quote often used as being "once a marine, always a marine" (00:09:20)
Suggested correction: First off, it was Hector who said he was an ex-Marine, not Benny. But just because someone goes against the cultural norm doesn't make it a mistake. There are a lot of Marines who refer to themselves as former or ex - Marines for various reasons.