After the armored car is stolen, someone remarks that the windshield was supposed to have bulletproof glass (although the bad guys shot through it), yet Noonan was able to easily smash the window out with a hammer.
As is the case with so many television programs, the bad guy attaches a suppressor (silencer) to a revolver. Those things only work on semi-automatic weapons with an actual chamber - not on a revolver with that small gap between the cylinder and the barrel.