Throughout the series, the Homicide department is shown as being divided into two shifts of detectives. At the time, the department was divided into three shifts, with each shift covering eight hours of the day.
A couple of times, reference is made to the other shift of the Homicide detectives as being the "night shift". However, at the time, the squads of the Homicide department regularly rotated shifts so that no one group of detectives would routinely have the night shift.
In a number of episodes, in-vehicle shots with a "back seat" perspective often show that the vehicle being filmed in is in fact a Chrysler-produced sedan. Note the older star-in-pentagon emblem on the steering wheel instead of the Chevy Cavaliers that the detectives drive. This is likely due to the lower headroom in the Cavalier, making it difficult to film that perspective.