Stupidity: Mason should have also removed the other gun he had in his office for display, or he could have removed the bullets from the guns. There is no reason he would have to use these guns for his victims, so it makes no sense to leave the other gun in his office or have them loaded with bullets.
Vacancy (2007)
1 stupidity
Directed by: Nimrod Antal
Starring: Kate Beckinsale, Luke Wilson, Ethan Embry, Frank Whaley
Continuity mistake: When the car dies on the side of the road the headlights are off, but when Amy gets out of the car to go with David you catch the headlights shutting off.