Here's one that's bugged me for a while and I was just reminded of when watching one of the recent episodes of Agents of SHIELD. That's roadblocks/checkpoints and people (our hero usually) driving on the road, sees one off in the distance, stops and turns around, all the while the people manning the roadblock/checkpoint don't seem to notice this car doing so. I would think that stopping and turning around from a roadblock would seem pretty suspicious to the people manning it and they would call out to the car to try to get them to stop and allowed themselves to be checked. It's also very convenient that when this happens they're almost always the last person in line and there's no other cars coming up behind, yet there are several cars in front of them. If a street is that frequented that there's at several cars ahead of them that have been stopped what are the odds that they (our hero) is the last one to go down that road for a good while?