Trunk says shell casings were found at the scene of each killing; Hammer identifies them as .38 special police issue. The vigilantes, however, are shown using revolvers. While automatics eject spent casings immediately after firing, revolvers must be broken open to remove spent casings.
This episode is a parody of "Magnum Force" in which Clint Eastwood as Dirty Harry tracks vigilantes who turn out to be police officers,.