Current Context

Ignoring context : Crossed arms don't mean much if the room is cold or the chair they're sitting in doesn't have armrests. Everything has to pass the common sense test given the environment. So ask yourself: "Should someone in this situation be acting like this?"

Not looking for clusters : One of the biggest errors you make is looking for one single tell. That's great in movies about poker players but in real life it's a consistent grouping of actions (sweating, touching the face, and stuttering together ) that is really going to tell you something. So ask yourself: "Are most of this person's behaviors associated with X?"

Good News: your first impressions are usually pretty accurate .

Bad News: whether they are wrong or right, first impressions