Random Trivia For This Title:
- Batman's computer password is "Iron Man Sucks"; although this is a DC film, Iron Man is the only Marvel character mentioned in it.
- Various actors provided voices for villains, but did not receive credit for their part. These include: Riki Lindhome as The Wicked Witch of the West, [?] Laura Kightlinger as Orca, [?] David Burrows as Mr. Freeze, [?] Matt Villa as Killer Croc, and [?] Lauren White as Medusa. Most of these actors provided voices for other characters.
- Early on, The Joker says that his plan is not like the "two boats" plan or "the parade with the Prince music." This is a reference to The Dark Knight, in which The Joker hijacks two boats and threatens to blow them up, and to Batman, in which he holds a parade to distract Gotham from his schemes.
- Eddie Izzard voices Lord Voldemort from the Harry Potter franchise as a cameo. Either coincidentally or not, Ralph Fiennes, who portrays Alfred in this movie, is, for many, most known for playing Voldemort.
- The villains from Batman's Rogues Gallery that appear in the film include: The Joker, Harley Quinn, The Riddler, The Scarecrow, Bane, Two-Face, Catwoman, Clayface, Poison Ivy, Mr. Freeze, The Penguin, Killer Croc, Man-Bat, Crazy Quilt, Eraser, Polka-Dot Man, Mime, Tarantula, King Tut, Orca, Killer Moth, March Harriet, Zodiac Master, Gentlemen Ghost, Clock King, Calendar Man, Kite Man, Catman, Zebra-Man, Condiment King, Captain Boomerang, The Mutant Leader, Hugo Strange, Red Hood, the Kabuki Twins, The Calculator, Dr. Phosphorous, Magpie and Egghead. While most of the villains are based on their comic book appearances, some resemble their live action movie counterparts. The Penguin resembles Danny DeVito from Batman Returns, Poison Ivy resembles Uma Thurman from Batman & Robin, Bane wears a brown and white parka, a staple of Tom Hardy's portrayal in The Dark Knight Rises (Bane actually looks identical to the dark knight comics) and Two-Face resembles Billy Dee Williams from Batman, as well as being voiced by him.
- The gremlins dismantling the plane is a reference to Roald Dahl's Gremlins book, originally owned by Disney.
- Will Arnett and Michael Cera play uncle and nephew (respectively) in the TV show [Arrested Development].
- When Batman arrives at The Fortress of Solitude and presses the doorbell, the sound is the main theme of Superman composed by John Williams.
- In the teaser trailer, Alfred refers to Batman going through "similar phases" in 2016, 2012, 2008, 2005, 1997, 1995, 1992, 1989, and a "weird one" in 1966. This is a clear reference to every year in which a major Batman film was released. The films in question are, respectively, Batman v Superman: Dawn of Justice, The Dark Knight Rises, The Dark Knight, Batman Begins, Batman & Robin, Batman Forever, Batman Returns, Batman, and Batman: The Movie.
- In early casting, Guillermo del Toro and Steve Buscemi were the front runners for voicing Bane and The Joker, respectively. Mindy Kaling was considered for the voice of Harley Quinn in this film.
- When the Phantom Zone is opened, the villains are shown flying out in a way that mimics the ghosts flying out of the sky in the first Ghostbusters movie.
- LEGO Bane's voice and accent is based on Tom Hardy's portrayal of Bane in The Dark Knight Rises. The voice is done by Doug Benson, a stand up comedian and podcaster, who has done his comedic impression on Hardy's Bane since the 2012 film was released. The directors were fans of Benson's podcast and hired him based on that.
- Ralph Fiennes is the third Academy Award-nominated British actor to play the character Alfred Pennyworth. The others are Michael Caine in the Dark Knight trilogy and Jeremy Irons in Batman v Superman: Dawn of Justice. Fiennes had also previously been shortlisted to play Batman in Batman Forever.
- Voice actor Will Arnett acknowledges that the raspy, whispery voice he uses for the Batman character is the same voice he uses with his children when he's giving them important parenting information.
- Billy Dee Williams voices the nefarious Two-Face in this movie. Williams had previously portrayed Two-Face's "good" alter ego, Harvey Dent, in Tim Burton's Batman. He was very eager to also portray Two-Face but did not get the chance to, due to Joel Schumacher taking over the franchise with Batman Forever and recasting the role with Tommy Lee Jones. Billy Dee Williams also reprised one of his previous roles in his appearance in The Lego Movie, playing Lando Calrissian from Star Wars: Episode V - The Empire Strikes Back.
- The airplane at the beginning of the movie is under the name McGuffin Airlines. "McGuffin" is the cinematic/literary name given to an object or person which is of vital importance to the characters but whose actual function is immaterial to the plot. The pilot at the beginning identifies his flight number to the control tower as "Flight 1138". This is a reference to George Lucas' first movie, THX 1138. The number 1138 was hidden in many of his successive films-- including the Star Wars and Indiana Jones movies. It became an inside joke for his fans, and since then the number has also been used in numerous other media not affiliated with Lucas, as an homage to his work and continuation of the joke.
- The shark repellent is a reference to the 1966 Batman movie. In the movie, Batman is trying to dislodge a shark attached to his leg while hanging off a helicopter ladder. He calls out to Robin to throw him "shark repellent bat spray" which he uses successfully.
- Morgan Freeman, who appeared in the Dark Knight trilogy and The Lego Movie, said that "The Lego Movie's" "Batman" is his favorite incarnation of the character.
- Batman's line in the beginning action scene, "You want to get nuts? Let's get nuts!" is a reference to the 1989 Batman movie where Michael Keaton's Bruce Wayne says this line to the Joker.
- Villains in the Phantom Zone include King Kong, Lord Voldemort, The Kraken and Medusa (from 1981's Clash of the Titans), Gremlins, The Wicked Witch of the West and Flying Monkeys (from The Wizard of Oz), Daleks (from [Doctor Who]), Velociraptors and the Tyrannosaurus Rex (from Jurassic Park), Sauron (from the Lord of the Rings trilogy), Agent Smith (from The Matrix), The Shark (from Jaws), Lord Vampyre, The Mummy and the Swamp Creature (from [Lego Monster Fighters]), and the Skeleton Warriors (from Jason and the Argonauts). Director Chris McKay originally wanted to include a number of villains from R-rated films among the Phantom Zone prisoners, but he was forced to drop as it was deemed too inappropriate for an all-ages movie to include them. Some of said dropped villains McKay wanted included Bill (from Kill Bill: Vol. 1), Annie Wilkes (from Misery), and Bill "The Butcher" Cutting (from Gangs of New York).
- Batman's crazy laugh is actually voiced by the director, Chris McKay. It was originally a placeholder before Will Arnett's laugh was to be put in, but never ended up being changed.
- Batman/Bruce Wayne and The Joker recreate the climactic scene from Jerry Maguire, with The Joker saying, "You had me at 'shut up'" instead of Renee Zellweger's line, "You had me at 'Hello.'" While neither says the line, "You complete me," Heath Ledger's Joker uses that line in a similar scene in The Dark Knight.