How about how easy it is to get machine guns in movies? You see it all the time, a group of people just shows up with several M240s or other hard to find weapons. How about zombie stuff? Yes, I'm thinking of 'Walking Dead,' society collapsed and yet most of the weapons people seem to have found were fully automatic? Sure, I get there'd be some military weapons left afterward, but I saw a bunch of H&K and some AKs in the last episode, where the frak would you find something like that, randomly? Automatic weapons constitute a tiny fraction of all firearms in the US, so where'd everyone find one?
Also, everyone has to have the newest weapons. In 'Walking Dead', they'd all be carrying hunting rifles or shotguns. Stuff you find in a good ol' boy's gun rack! The thing that got me on the movie, "Quigley down under" was how all these Australians had the latest American pistols? Those would cost a fortune in such a place and time!