The following graffiti can be found on the city's walls, at the beginning of the movie: "Only a Bright can control the power of the wand. (The Great Prophecy 7:15)" (Not a graffiti.), "In the beginning, God created all races equal. (But Elves are more equal.)," "Orcs fight for you... Who fights for us?," "In Magic We Trust. (Die)," "Be Yourself," "Jirak Lives" and "They hold you up to keep us down."
In the strip club, a woman is seen blinking a nictitating membrane - a third eyelid seen in some reptiles, sharks, and birds. Will Smith's character in Men in Black (1997), an NYPD cop, sees the same blinking happen on an alien he's pursuing (and the catalyst for K recruiting him).
The trivia items below may give away important plot points.
The scene where Dorghu orders his son Mikey to execute Jakoby, Mikey can't bring himself to do so, because he is the young orc that Jakoby let get away in the begining of the film; almost mirroring the bathroom scene in David Ayers Training Day where Ethan Hawkes character is spared for helping out a young girl earlier on.
The scene where Jakoby grabs a large gun, leaving Ward with a small gun, and Ward protests and grabs the larger gun instead, echos Will Smith's character in Men in Black, when Agent K gives Agent J the tiny Noisy Cricket gun, to his dismay.