One of my favorite Hollywood Firearm Faux Pas occurs when the actors show us that the gun isn’t really loaded. I’ve seen 2 separate cases.
First, years ago, I saw it on one of the Law & Order shows. Someone was shooting deaf people. The shooter pulls a Glock out of his jacket, pulls the slide back, and it locks open! He then reached up, pushed the slide-lock down, and took careful aim at his unwitting target.
For those that don’t know, the slide on a semi-auto only locks open when the gun has an empty magazine, or the shooter reaches up and presses a certain lever.
A second case occurs in White Collar when the character Neal Caffrey pickpockets a gun away from a bodyguard and unloads it. First, he removes the magazine and then he pulls the slide back. There was a round of ammo in the chamber, but we can clearly see that the magazine was empty. Apparently the bodyguard chose to carry a 15-shot pistol loaded with only 1 shot. Later, Caffrey hands the Beretta to an FBI agent. First, he drops the magazine – now it suddenly does have a round of ammo at the top! It’s a continuity error, too.