>> Watch to see if they make or keep eye contact. Are they more interested in the map on the wall behind you? I specifically interview in a room in our office that has a really neat picture of Earth. I want to see what they are more interested in, the interview or the photo.

Many IT people won't make eye contact.  You can lose a really good candidate because they wouldn't make eye contact, and they focused on the "neat picture".  This emphasis on socialization trivia (eye contact), in a technical field involving a heck of a lot of asocial "geeks", if you will, is not only a waste of time, but a good way to lose proficient candidates.

>> Look to see if their clothes are pressed and clean

Completely irrelevant (in IT).  Some of the most brilliant, productive IT staff I've worked with wouldn't know a clothes iron if it hit them in the head.