Linda doesn't appear in "Wingman", "The Weaponizer", "What Would Lucifer Do?", "Welcome Back, Charlotte Richards", "The Sin Bin", "City of Angels?" (Justified since it's an Origins Episode), "Til Death Do Us Part" and "Boo Normal".
Ella is completely absent from "Monster", "Stewardess Interruptus", "Mr. & Mrs. Mazikeen Smith", "City of Angels?" (Justified since it's an Origins Episode) and "Til Death Do Us Part".
Amenadiel and Lucifer's mom are absent in "My Little Monkey". This is likely due to the heavy focus on Chloe's backstory and Lucifer dealing with the fallout of revealing his true face to Linda from the aforementioned episode.
Trixie doesn't appear in a number of episodes, most likely due to child labour laws. In the first two seasons, she appears in 10 episodes each season, missing out 3 in Season 1 and 6 in 2. In season 3, she appears in 12 out of 26 episodes, while in season 4, she only misses out 3 episodes ("Somebody's Been Reading Dante's Inferno, "All About Eve", and "Expire Erect"). Season 5, however, has her miss out a lot of episodes, as Scarlett Estevez is no longer part of the main cast. She only appears in two out of the first eight episodes ("Really Sad Devil Guy" and "It Never Ends Well for the Chicken").
Maze does not appear in the first few episodes of season 3, only appearing in the episodes that were held over from the second season (see Out Of Order below). This is due to Lesley-Ann Brandt being in the final stages of her pregnancy and giving birth.
Tricia Helfer plays Charlotte Richards and the Goddess using Richards' body as a host.
In season 4, Graham McTavish plays Father Kinley and the demon Dromos who possesses Kinley after Eve murders him to send a message to Hell.
Season 5 features Tom Ellis pulling double duty playing Lucifer and Michael as its main selling point. Noteworthy since both are main characters who frequently appear together, requiring massive editing to work it out.
The season 5 episode "It Never Ends Well for the Chicken" has nearly everyone, except for Tom Ellis, playing a new character.
Lesley-Ann Brandt plays a young Lilith. Lucifer's narration lampshades the fact that Maze looks exactly like her mother.
Tom Ellis (Lucifer) is a pretty good singer. He opens episode 6 of the first season with a very good rendition of "Sinnerman", his rendition of "All Along The Watchtower" by Bob Dylan is particularly impressive (sung in the first episode of season 2), and he sings "Eternal Flame" in "Candy Morningstar". The showing off continues into Season 4, when the first thing the viewer sees in "Everything's Okay" is Lucifer singing Radiohead's "Creep". He's also a good juggler.
Lesley-Ann Brandt gets a chance to show off her own singing chops in "Save Lucifer" with a performance of "Wonderwall" by Oasis. "It Never Ends Well for the Chicken" has her sing two songs as the classy chanteuse Lily Rose/Lilith.
The fourth season finale opens with a dance sequence set to Kenny Loggins' "I'm Alright" which gives Tom Ellis and Aimee Garcia a chance to show off their dancing skills.
Channel Hop: The first three seasons aired on Fox. A month after Fox canceled it, Netflix picked it up for three more seasons. The change is immediately noticeable, since Netflix, being a streaming platform, has less stringent policy on explicit content than Fox, a broadcast network.note The first episode of season 4 alone features a look at Tom Ellis' bare buttocks within the first six minutes, while the sixth episode has the main characters visiting (and participating in) a naturist community, both content that they would have never gotten away with if the show still aired on Fox.
Downplayed with Chloe. She is 35 years old as of the season 2 episode "Quid Pro Ho", while Lauren German was 38 at the time.
In "Lucifer! Lucifer! Lucifer!", it is revealed that a seventeen-year-old Linda gave birth in 1994, which means she was born in either 1977 or 1976. Rachael Harris is almost a decade older (born 1968) and visibly older than the rest of the cast (most of whom were born in the 1970s).
Directed by Cast Member: Kevin Alejandro (Dan) directed the episode "Once Upon a Time" that was one of a pair of episodes shown in the last week of May 2018, the other being "Boo Normal". He also directed the season five episode "Spoiler Alert".
Fan Nickname: Lucifer's mother/Charlotte is nicknamed in some circles as "Momlotte", given that her real name has yet to be revealed. Ultimately the show just went with Goddess, despite God actually having a name in The Bible, YHVH/YHWH, the closest pronounceable approximation being Yahweh.
Genius Bonus: Several. For instance, in one episode, Lucifer states that Oscar Wilde was straight before he met our titular devil. Knowledgeable viewers will know that Wilde, while famous today for his homosexuality, had sexual affairs with several women before he married. Only after his wedding did he seem to have started having sex with men exclusively (besides his wife, of course). It's theorized that one of the reasons was since his rationlized same sex as not really cheating.
Germans Love David Hasselhoff: In the U.S., the show was never a huge hit, and got slammed by Moral Guardians who accused the show of glamorizing Satan. However, the ratings were decent enough for Fox to keep renewing the show for three seasons. The show had a much bigger audience overseas, especially in Catholic-majority countries, which is the reason why Netflix picked up the show after Fox canceled it.
After the Behind the Scenes look for episode 14 "Candy Morningstar" was released, plenty of fans correctly guessed that Lucifer's marriage to Candy was fake.
Likewise, many people managed to guess that Lucifer gets his wings back in 2x18.
After a writer dropped a hint that the season finale would end on a cliffhanger, a number of people managed to guess that the cliffhanger would be Chloe discovering the truth about Lucifer.
Lying Creator: During the filming of the Arrowverse's Crisis on Infinite Earths event, fans spotted Tom Ellis in the Vancouver area, leading to instant speculation that Lucifer would be part of the crossover. Ellis announced he had simply been visiting a friend on set to shoot the rumors down. Sure enough, Lucifer did pop in Episode Three for a brief cameo.
The Other Marty: In the unaired pilot, Dan was played by Nicholas Gonzalez, before being replaced with Kevin Alejandro.
Older Than They Look: Ella Lopez looks and acts like a perky 20-something. Her actress, Aimee Garcia, was born in November 1978, meaning she was 37 years old when she first appeared. She is actually the same age as Lauren German (the two nearly share a birthday, with Garcia being a day older than German) but looks far younger than the latter.
Out of Order: "Mr. and Mrs. Mazikeen Smith", "Vegas With Some Radish", "Off the Record" and "City of Angels?" were originally meant to be season 2 episodes but they were moved to season 3. Likewise, two standalone episodes were produced at the end of season 3 with the intention of showing them in season 4, but FOX cancelled the series and later announced they would be airing the two episodes a couple of weeks later (this was of course well over a month before Netflix ultimately resurrected the show). The two episodes ended up being somewhat disconnected from the ones before and after them; one is a What If? episode, while the other is set in a weird timeline where Chloe takes Lucifer's revelation of his devil face lightly, compared to her near-Heroic BSoD in the actual Season 4.
A doctor in a plastic mask gives a Sadistic Choice to a successful person: cut off what makes you successful, i.e. an actor's face, a surgeon's hands, etc., or an innocent person will die horribly. The man behind the mask? Tim Dekay, known mostly for playing Incorruptible Pure PurenessLawful Good good guys. And because he's such a typecast actor, the viewers never see The Reveal coming.
After three seasons, Fox decided to cancel the show. This led to major outrage, especially as the third season finale left off on a cliffhanger created specifically to get a renewal. Much rallying on social media by fans as well as some of the cast and crew to #SaveLucifer led to Netflix deciding to resurrect the show.
After the show moved to Netflix, the creators announced that the series would end after Season 5, in line with the network's usual upfront two-season deal. Two months before the premiere of the supposed final season, Season 6 — the "final final season" — was confirmed.
Maze was originally going to be played by Lina Esco, but Lesley-Ann Brandt got the part instead.
Two season 3 episodes - "Boo Normal" and "Once Upon a Time" - were supposed to be part of the potential fourth season before the show was canceled by Fox (but before Netflix picked it up). The two were screened two weeks after the season 3 finale back-to-back. Judging by "Boo Normal", it's telling that the creators originally had much different ideas for the fourth season, whose run in Netflix basically retconned it out of existence.
Lucifer was going to have an American accent, until they decided only a Brit could get away with saying a lot of his lines without coming off as a total douche. And the appearance of Michael in Season 5 fully proves that point.
On the flipside, Lesley-Ann Brandt admitted that she wanted to portray Maze with a British accent (likely to match with Ellis), but was told to speak with an American accent instead. Both, by the way, are not her natural accent, which is South African (she is also fluent in New Zealand English by virtue of growing up there since she was a teen).
Written-In Infirmity: Rachael Harris' pregnancy was written-in in season 4 with Linda getting pregnant with Amenadiel's son.
The #SaveLucifer Campaign After the show's cancellation by Fox, fans repeatedly pushed the hashtag to the Top Ten trending on Twitter and shared why they wanted the show to return. The producers of the show, along with the cast, praised the fans for the campaign and worked to help however they could, with interviews and updates. After almost a month of uncertainty, #LuciferSaved. Netflix grabbed the show a day before the actors' contracts were set to expire. The cast were ecstatic to hear the news, with Rachael Harris appearing sans makeup to quickly spread the news, Aimee Garcia filming a shocked reaction in her car, and Scarlett Estevez's mother surprising her in a video and her face lighting up in excitement.