This is an excellent site run by John Habershon, a non-verbal communications specialist.
It’s designed to help those with Asperger’s and HFA to learn where to focus on the face and the changes to note. Each week he covers a different subtle emotion, describing it and listing key points. The 10-15 second video shows an example, in real time and then slow motion. Here is an example
Watch all the Facial Expression Recognition Videos
Lots more on the Aspergers 101 website worth exploring. Check it out HERE