The name Freight Bay is from the sign above the entrance to where Boykin is holding Rebecca.
The name Underground Loading Bay comes from the case 6-2 engaged case screen.
Warehouse D is one of at least three locations which only appears after a flag in the programming is activated. Before Case 6-2: Last Stand the room past the closed metal sliding door does not exist. The other locations with similar attributes are the Secret Lab where Case 7-2: The Only Lead and the zombie harvesting takes place, and the blast wall in the Atlantica Casino, which only appears after Case 3-2: Run for the Money is completed.