The NFL goes to great lengths to attempt to ensure that every play is called correctly. It’s why every broadcast network has a rules expert on the payroll to explain the intricacies of the rulebook during replay reviews. You have seven guys in stripes on the field for every play, keeping a close eye on everything. And for anything they might miss, there are a dozen cameras trained on every inch of the field ready to be examined during an ever-growing list of reviewable plays. The refs still screw up all the time, of course, but what’s important to the NFL is that they appear to be doing everything in their power to get it right.