When Bosch emerges from the tunnel when he is chasing Waits he suddenly doesn't have the flashlight he had been carrying.
The trial against Harry Bosch was a civil case "in and for the city of Los Angeles" and is a state court case. It would not be heard in United States District Court, which is federal court.
When the bosch and his partner are driving out to do the death notification you can see the right rear door panel is missing inside the crown vic. On the way back from the desert the door panel is now there.
A bunch of times you see the front end of Bosch's police car and it has a slotted black grille indicating this is a 1999-2000 police interceptor. In other shots it now has a honeycomb grille indicating the car is a 2002 or newer.