Executive producer Barney Rosenzweig was married to co-creator Barbara Corday when the series started. They eventually divorced and Rosenzweig later married star Sharon Gless.
Cast member Sidney Clute passed away during the run of the show. The producers included his name and picture during the opening credits of every episode after his death as a tribute to him.
The screenplay for the pilot was originally written in the 1970s for a featured film that never materialized. After the success of Charlie's Angels (1976), producer Barney Rosenzweig shopped an edited version of the screenplay as a possible TV series. It took many years for the script to be produced because the networks felt that there was no audience for a realistic show about female detectives.
Dep. Inspector Knelman: [about a law suit filed against New York for $ 7,000,000]
Don't you find it ironic that the city of New York is paying you to accumulate evidence so that... it can be sued?