The building used for the exterior shots of the US postal inspectors is the Post Office for Washington DC 20002 and the home of the US Postal Museum at 2 Massachusetts Ave NE, Washington, D.C.. The actual DC HQ is located at 475 L'Enfant Plaza SW, Washington, D.C.
A letter carrier escort is when a postal inspector(s) shadows a letter carrier into the more dangerous areas where robberies are on the rise. The main objective is to protect employees. Mail Delivered; Carrier Safe; Mission Accomplished.
The exterior shot of Amanda's and Preston's home was also used in the show Army Wives, which also stared Terry Serpico.
Anthony Michael Hall guest starred in an episode.
One aspect of night duty, entails staking out and surveilling post offices.