Trivia: Freddy wears several T-shirts of Aquaman, Wonder Woman, Superman and Batman during the movie.
Trivia: Near the end, when Shazam is fighting Dr. Sivana (Mark Strong), Strong says "playtime is over" which is the exact same line he says in Kick-Ass (2010) to Hit-Girl.
Trivia: The fallen champion mentioned by the wizard is a reference to Black Adam, an arch enemy of Shazam.
Trivia: The Anabelle doll from The Conjuring is seen in the pawn shop where Billy locks up the officers.
Trivia: In Freddy's room there are many references to Justice League storylines like an issue of Time Magazine referring to General Zod's invasion, and a Batarang.
Trivia: One of Billy's foster siblings, after gaining the Shazam powers, tries to fire a bolt of energy from his hands. He says, "Hadouken" as he attempts the attack-a reference to Capcom's Street Fighter series of video games. Later, one of the others says, "Finish him" upon the defeat of the main villain-a reference to the rival game, Mortal Kombat and the signature phrase of its main boss, Shao Khan.
Trivia: Spoiler: At the very end of the movie, Superman makes an appearance at the school cafeteria. He is referenced many times throughout the film.
Suggested correction: How is this trivia? It's obvious in the film.
Some stuff like this is interesting to read about even if you've not seen the film yet. I didn't know that scene existed, for one.