Not making eye contact
Failing to make eye contact was the body language mistake interviewers were most likely to say they hated. Sixty-seven percent of people surveyed said they didn’t like it when candidates kept their eyes cast down. While you don’t want to get into a creepy staring contest with your interviewer, looking at them while listening and speaking shows you’re engaged in the conversation
Playing with something on the table
Thirty-four percent of hiring managers cited fiddling with pens or shuffling papers as a major example of poor body language in an interview. Clicking a pen or similar gestures can be interpreted as a sign of anxiety.
Crossing your arms
Crossing your arms in front of your chest makes you look defensive and hostile, so it’s no wonder that 32% of HR managers said this was not something they liked to see in people they interviewed.
Not sitting up straight
Slumping in your seat doesn’t convey confidence. Thirty-one percent of HR experts said it made candidates look less than polished in an interview. Sitting up straight and squaring your shoulders not only makes you look confident, but it also shows you respect your interviewer and the situation you’re in.
Using too many hand gestures
The higher the gesture, the more out-of-control you look. The key in an interview is balance: Some hand movement keeps you from coming off as too stiff, but too much and you could look like a loose cannon.
Source: http://bit.ly/2hT2i3X