I'm a little disappointed in this article, in that upper face movements are generally (as far as I've read and seen) very reliable indicators of emotion. The only two common misconceptions I've read about are this, which is a confusion likely caused by brow furrowing and lower eyebrow tensing used in some anger faces and while concentrating, and when some women crinkle their nose when they enjoy something, which is also used when feeling disgust.

In general, people (especially men, who perform less well in face-reading tests) are more likely to miss a emotion on someone's face or not know what it means than misinterpret it (http://www.dailymail.co.uk/health/article-2273571/Why-men-ha...).