Despite this entire show being about adding security to the shop; security cameras and bars on the windows, they only show one video camera being used. Subsequently, no bars were ever installed on the windows.
After Arthur is done firing his gun, he just drops it on the counter. Without checking to see if the chamber is empty. This is not how to handle a weapon properly, and could lead to serious injury or death. Learn how to properly handle guns.
Tush describes the Beretta 92FS as a double-action pistol, but it's actually a double/single-action, which can be fired double-action, but is normally fired as single-action. The 92D is the double-action only version.