The mock-up of the "Los Angeles Chronicle" with the story hinting that Carpenter's death was not suicide but murder has been used in other episodes. It contains the headlines "Building Codes Under Fire" and "State Boards Investigate Fraud Charges" that appeared in editions of the paper in other episodes.
In the office scene where Perry is dictating to Della from a book, when he says "California State Penal Code, section 1362, dealing in competency as evidence when witness uh...," he is speaking of an actual and appropriate section of the CSPC.
One of the few cases after the first season that went to a jury trial. Maybe that's why the assistant DA was allowed to overact, although he was slow to object when Perry asked Andrew Collis if he was in love with Anita Carpenter.