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.
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.
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.
Ron Cephas Jones was initially cast as The Wizard, but scheduling commitments to This Is Us led to him to depart the project. Notably, this news only broke months later, when filming was done and in post-production, in contrast to the many immediate reports of on-set drama for previous DC Extended Universe films.
Originally, Black Adam was to debut in this film portrayed by Dwayne Johnson, but the producers decided to split the film into two origin films for both characters. Johnson is still credited as an executive producer for this movie.
A Shazam movie was in development back in the early oughts, with writer John August attached. The film was shelved due to the failure of Speed Racer and the massive success of The Dark Knight, which caused WB to think that there wasn't an audience for a Lighter and Softer comic book movie.
The original script contained a cameo from Henry Cavill as Superman, but he had scheduling conflicts, and thus the plans were altered. In the finished film, the character is simply played by a Fake Shemp whose face isn't shown.
The scene where Sivana reunites with his father and brother at Sivana Industries and kills them, along with innocent people, was originally going to be at a Christmas party in his mansion. The scene was shot but they decided to reshoot it at Sivana Industries.
There was going to be a scene early in the film between Billy and Mary when he was about to sneak out, but the scene was pulled out so they can get to Shazam's character.
During the fight with the Seven Deadly Sins, Mary, in her superhero form, taunts one of the Sins and punches them while she's laughing and also while she sings and dances. This scene was cut for time.
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.