In a recent interview recollecting on this movie, Karl Urban said he refused to smile or take the helmet off at any point during the movie's filming or even in between takes. He spoke with an American accent and kept a scowl the whole time and stayed serious to keep in character. At one point, a cast member made a joke causing laughter on the set, and Urban gave him the 'Dredd' stare, prompting the person to immediately apologize.
Unlike the previous Judge Dredd movie, Karl Urban has confirmed that the helmet will never come off to keep true to the comic book character.
In the classroom in Peach Trees, as well as in the mall, the new American flag can be seen. It only has 6 stars representing the mega states.
Some of Ma-Ma's tattoos are Lena Headey's actual tattoos, most notably the flower on her upper right arm. The make-up artists took the design and expanded it to her neck and her face.