The telephone records, LUDs, is Local Usage Details.
Well, I guess it beats dousing yourself in rum and lighting up a Cohiba.
When the detectives are interviewing someone or working a crime scene, they are never seen taking notes. Real detectives are constantly taking notes. The notes are so important that they are occasionally booked into evidence to ensure the originals will be available for review before trial.
After the attack on the World Trade Center the opening was changed for one episode to reflect the sacrifices of the NYPD and the NYFD.
The DVD release of the series will include footage not originally broadcast.