I have a couple of thoughts:

I've seen that vacuous stare.

Also, the psychopath, while an intuitive observer of others (they need to be, in order to manipulate), they sometimes seem totally oblivious of their own signals. They may have inappropriate gestures in social situations, or they may be speaking to one person, but maintaining eye contact with another. My psychopath boss tends to stare at me when speaking to others.

I think that cruelty to animals may be more predominate in the male psychopath than the female psychopath - though, I'm not certain.

A possible explanation for the apparent display of empathy (tears) at the movie, may be that the psychopath identifies with the character in the movie and the tears are for themself more than the movie character.

Fear - and this is an unsubstantiated theory on my part - fear, may enrage the psychopath because inside the psychopath is a great deal of fear and insecurity. They probably learned at a very young age that agression means winning and they use it unabashedly.

Money represents control a main objective of the psychopath. Again, here is another unsubtantiated theory on my part: the psychopath probably has the least control of themselves, a complete inability to control themselves, then spurs them to seek to control others, whom they blame for their own problems. Seeing themselves as less than masters of their own destiny, and always seeing blame in others causes them to attempt to control those around them in an effort to achieve an inner peace that is totally lacking in themselves. If they can control those whom they blame for their own inadequacies, then all would be perfect in their world.

Just some ideas I have. I'd be interested in how others think about my ideas. Perhaps, your experiences or your studies can help feel in the gaps as I am still learning.

-denfox
Ancaro imparo [I am still learning] - Michelangelo