When Sophie and Gregory are listing facts about staff retention and safety, none of the math makes any logical sense.
The Health and Safety Department and Gregory Goshawks Office locations were filmed in the same room.
In the final scene, the desk, chair and actors are the only real items. The room around them is completely CGI.
In the opening scene where Sophie is being welcomed by a M.U.M unit, you can look for and recognize filming gear through the door windows.