The cow spoiled it for me. (Spolers)
Seriously the moment after the incident I had my theories, and the fact that Damon was so ... fascinated and calm was helping, as well as when he talked about his pen. But seriously the moment he said "Agiitate the Subject" and I saw the cow that was it. Agitate was the keyword, and cows are well known symbols of alien abduction.
Also when Nic escapes I was 100% sure Damon was a robot because of the way he looked around himself, instead of moving his neck, he opted to move his whole body. I know if he moved his head left or right we'd see his eerm...hardware? but that was just red lights everywhere for me.
Also, did anyone think that NOMAD wasn't only reverse of Damon but also an explanation of the Alien race? After all it didn't seem like they had their own planet. Then again with tech like that they probably didn't need one.