The Horowitz family live, as the exterior shots make plain, in a tenement on the Lower East Side of New York. However, the interior shots show large, freshly painted, and well-furnished rooms that could not exist in this narrow, cramped building in a very poor neighborhood.
The policeman says that killing someone in a fight, unless the killer can prove self-defense, is murder. This is wrong. Murder requires malice aforethought. The killer in this instance would be guilty of manslaughter.