Lizzy Caplan replaced Isla Fisher due to Fisher's pregnancy. In September 2016, Caplan was officially announced as Fisher's full-time replacement, as Fisher won't be returning to the franchise.
A third installment of the Now You See Me franchise was announced over a year before this movie, and is set to come out 2019.
Walter Mabry (Daniel Radcliffe) says that he dabbled with magic while he was at school. Radcliffe, of course, played Harry Potter in all eight films of the franchise, where he used magic.
This the sixth time Morgan Freeman and Sir Michael Caine appear in the same project. They previously starred together in Freedom: A History of Us (2003), Batman Begins (2005), The Dark Knight (2008), The Dark Knight Rises (2012), and Now You See Me (2013). They appeared a seventh time in Going in Style (2017).
A major plot point of the film is The Eye, the society to which the Four Horsemen are trying to prove themselves. The establishing shots of London very prominently feature the city's large Ferris wheel, known as the London Eye.
When Atlas slaps the fake ID on the engineer's wrist, his ID reads "Mark D. Stooge" as in the "Mark" (someone who is the target) and "D. Stooge" (as in the stooge, or fall guy).
When Dylan enters Thaddeus' jail cell, music can be heard in the background. Fitting the film's overall revenge and vendettas themes, the song is "Der Hölle Rache kocht in meinem Herzen" (The Revenge of Hell Boils in My Heart), from Mozart's opera The Magic Flute.
Merritt (Woody Harrelson) said he wasn't a "David of Michelangelo" under the suit, in the first movie. In this film, he said he was a David.
The film cast includes two Oscar winners: Morgan Freeman and Sir Michael Caine; and three Oscar nominees: Jesse Eisenberg, Mark Ruffalo, and Woody Harrelson.
Lizzy Caplan stars here with Dave Franco. She also starred in 127 Hours (2010) and The Interview (2014) with his brother James.
Many actors in the film have starred in films based on comic books: Morgan Freeman and Sir Michael Caine in the Dark Knight trilogy, Jesse Eisenberg in Batman v Superman: Dawn of Justice (2016), Mark Ruffalo in the Marvel Cinematic Universe, and Jay Chou in The Green Hornet (2011).
Actor connection: Mark Ruffalo and Morgan Freeman come together in this film, but both have been in a David Fincher film; Mark in Zodiac (2007), and Morgan in Se7en (1995).