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)
Character mistake: Chloe, Maze, and Ellen are discussing a murder and the death of Vernon Gill who was killed when hit by a car after he was fleeing pursuit from Chloe and Maze. They were discussing Dirty Doug who came in last night and Maze says "he came in last night and Gill said he threatened him for taking credit for Lee's murder." How could Gill say anything when he was already dead from being hit by a car. Should be "he said Gill threatened him" not Gill said since Gill's dead, in hell. (00:30:55 - 00:32:00)
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.
Lucifer! Lucifer! Lucifer! - S5-E2
Character mistake: Chloe and Lucifer are sitting in Chloe's police cruiser staking out a suspect's car, and they get into a pursuit with the suspect in his Porsche. Chloe's police cruiser had no police lights or sirens blaring during the pursuit. Plus they are in a heavily populated metropolis; doesn't make any sense why they wouldn't have their lights on. It's standard police procedure to alert other drivers an emergency vehicle is on route, so they can yield/pull over and take care. (00:22:20 - 00:24:00)
Character mistake: Charlotte Richards says to Amenadiel that he and Pierce were "both former immortals who became mortal." Amenadiel never lost his immortality in any of the previous episodes, he just lost his powers. He can be killed by celestial objects like blades or other sharp objects. Pierce however did lose his mark because of Chloe's love, it is assumed, so he became mortal. (00:12:45)
Devil Is as Devil Does - S4-E7
Character mistake: On Earl D. Bolden Jr.'s wanted poster, it says "if you see this man NO NOT approach..." It should say "DO NOT."
