Ability over Appearance: Zachary Levi did bulk up properly for the role of the main hero, but even with that effort his build and features aren't quite what you'd expect for an old-fashioned superhero. No one seems to be lamenting him as being miscast, however, as fans and critics alike have given him high praise for very effectively capturing the essence of a teenage boy suddenly turned into an adult Flying Brick.
Acting for Two: Director David F. Sandberg plays one of the Crocodile-Men and voices Mister Mind in the mid-credits scene.
Mark Strong has been openly enthusiastic about playing Sivana, describing him as an "evil bastard" and saying how those roles are always fun to play. (He has done a DC villain before, playing Sinestro in Green Lantern).
David F. Sandberg has been excited about doing a superhero film, especially for a character he didn't know that well. He also mentioned how much he loved voicing Mr. Mind, if only for a few lines, and his delight in performing the role is unmistakable.
California Doubling: The film is mostly set in Philadelphia, but was filmed in Toronto (with a team that was sent to Philly to take aerial views). This is specially noticeable on the subway scenes, which clearly use TTC cars, and Greenwood station was used as the place where Billy runs from the bullies.
The exterior of Sivana Industries' tower is actually the IDS Tower, in Minneapolis, the rest of whose skyline fills out the background of the establishing shot.
John Glover was 73-74 when playing Thaddeus Sivana's father, and did so for both the modern day and 1974 scenes (the character would be about 45 years younger in the latter).
Grace Fulton plays Mary Bromfield who is a high school senior, thus a few years younger than her real age (early 20s).
Deleted Scene: The editor of the film, Michel Aller, revealed there are 20-24 minutes of deleted scenes of the film, (most of them turned out to be alternate scenes that weren't used). Amongst them:
An alternate beginning where Thaddeus Sivana is having Christmas lunch with his family (the scene also includes his mother and twin sisters, completely absence in the final cut). Mr. Sivana orders Sid to taking away Thaddeus' magic ball and he runs away in an elevator where he encounters the Wizard Shazam. After not being accepted, he returns to his home, where he receives a fist from Sid.
The battle in the Christmas Village is a bit longer.
The Shazam Family sitting on the thrones. Mary notes that since there's only six of them, one is empty and wonders who it's for. Darla replies that no matter who it is, that person will automatically be part of the family.
A scene where Billy attempts to escape from the Vasquez home but he's stopped by Mary Bromfield.
An alternate ending where the Shazam Family built a new Christmas tree and prepare themselves to fight a new crime.
An alternate "Lighting with my Hands" scene (this time in a anonymus street instead of the Philadelphia Museum of Art). This scene was featured in the trailers.
A alternative scene of the Thaddeus Sivana's revenge on his family (this time taking place during a Christmas celebration in Sivana's mansion instead of the Sivana Tower).
Billy Batson, in his Shazam form, has a tea party with Darla.
Darla finds out that Freddy had been once again the victim of bullism from Brett Breyer.
A scene where Freddy, in his avatar form, flies near an airplane.
Darla blackmailing Billy into playing tea party as Shazam. She then asks him questions like how does it feel to be hit by the lightning and what happens to his clothes during the transformation.
Descended Creator: David F. Sandberg played two roles in the film. He was the creature performer for the Crocodile-Men and then lent his voice to Mister Mind in the mid-credit scene.
Fan Nickname: "The Real Captain Marvel" or "The Original Captain Marvel", for the people who aren't fond of the name change. "The Big Red Cheese" gets a lot of out-of-universe play and "Captain Sparklefingers" has stuck quickly as well.
The term "Shazamily" has been used for Billy and his foster family, especially considering they all get the powers of Shazam in the climax.
In the Japanese dub, Megumi Ogata's role as Billy goes somewhat meta for her, as she seldom works in foreign dubs, being her most recent dubbing job was voicing ADA in the Japanese version of Ingress (and also in the animated adaptation), and before that, her other dubbing jobs dates backs from the 2000s, being the Japanese dub of Hackers the last live-action dub she ever did before this film.
Production Posse: Sandberg has cast Grace Fulton, Andi Osho and his wife Lotta Losten. Both Fulton and Losten appeared in Annabelle: Creation before, and Lotta Losten and Andi Osho also played in Lights Out.
There is also an The Loud House reunion with the siblings; Billy (Emilio Treviño), Freddy (José Luis Piedra), Mary as a super-heroine (Leyla Rangel) and Pedro as a super-hero (Víctor Ugarte) are Clyde, Lincoln, Luan and Bobby respectively.
Saved from Development Hell: The development of a Shazam movie started in 2000 with New Line Cinema, Peter Segal, John August working on the project, but went nowhere for several years. New Line Cinema was eventually bought by Warner Bros., and August left the production when film executives requested that the movie be made Darker and Edgier due to The Dark Knight being all the rage at the time. From there, the project shifted development from a movie to a television series in 2013 - but Peter Segal stated that, at that point, the adaptation was unlikely to happen. The film was saved in 2014 when DC and WB announced plans to adapt the character to film, and was confirmed to be in development later in the year, as part of the DC Extended Universe. David F. Sandberg was eventually announced to helm the film in July 2017.
Show Accuracy/Toy Accuracy: Spoilering the rest of the Marvel family is one thing, but the action figures come with the Seven Deadly Sins as well... which are a lot smaller and differently colored from what you see in the movie.
Spoiled by the Merchandise: Basically all of the film's toylines prominently featured the superhero forms of Freddy and the other foster kids, something that the film itself doesn't reveal until the climax and the trailers, in a rare display of restraint, never even hinted at.
Djimon Hounsou voiced the Fisherman King in Aquaman before playing the Wizard in Shazam! As his performance in Aquaman is limited to giving King Ricou three lines it would be easy to overlook this connection.
Natalia Safran, who played Queen Rina in Aquaman also plays a scientist working for Dr. Sivana in SHAZAM!.
Sound familiar: French voice actor Donald Reignoux dubbed both Jesse Eisenberg's Lex Luthor and Freddy Freeman's superhero form.
Being a New Line production, this movie has a much smaller budget than a typical studio superhero movie. Its $80-90 million budget is about half that of its predecessor in the franchise, Aquaman.
The movie infamously was the only movie available in some theaters in Australia and Mexico.
Sandberg's brother Joachim Sandberg makes a small cameo in the film as one of the extras in the mall fight scene.