Continuity mistake: The homeless beggar at the entrance of Peach Trees gets splattered by the blast doors closing, creating a pool of blood on the ground. When they open again at the end of the film there is no blood or body.

Dredd (2012)
Ending / spoiler
Directed by: Pete Travis
Starring: Lena Headey, Karl Urban, Olivia Thirlby, Andile Mngadi, Porteus Xandau, Rachel Wood
Judge Dredd (Karl Urban) kills Ma-Ma (Lena Headey) by throwing her out a window and gives her a dose of the drug Slow-Mo before tossing her. Even though Ma-Ma has a set of explosives rigged to her pulse, Dredd believes that the signal won't reach the building's top floors. Judge Anderson (Olivia Thirlby) accepts that she didn't pass her evaluation because she was disarmed during the mission, but the Chief Judge asks Dredd if Anderson passed or failed, and he says that she passed.
Neuman
Dredd: Been wondering when you'd remember you left your helmet behind.
Anderson: Sir, a helmet can interfere with my psychic abilities.
Dredd: Think a bullet might interfere with them more.
Question: Why doesn't Kay kill Anderson after he grabs her and takes the elevator up to Ma-Ma? Or at least, why doesn't Ma-Ma kill her when Kay comes in with her? They were intent on killing the Judges and didn't care about the consequences. So what was Ma-Ma hoping to accomplish having her as a hostage that she couldn't try to accomplish without one? At this point, she already had the 4 crooked Judges on their way.
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Answer: Kay wanted to punish her for what she did to him earlier. Ma-Ma wanted leverage against Dredd should he get past her Judges.
MasterOfAll