Cracked pays people to make smart memes. Visit the Photoplasty and Pictofacts Workshop to get in on it.
Whether it's deliberate or not, filmmakers have a habit of cramming historically-impossible details into their movies and shows, all the time. Since literally everything can be searched in the palm of your hand, now, we're going to go with "deliberate."
Shoutout to Tomkat53, whose tolerance for anachronisms is the only thing keeping him sane, for suggesting this contest.