Do you remember watching the teaser trailer for the first time? That sense of awe and wonder got us so excited for this mysterious new show from HBO. I was watching it again recently (because I clearly have a lot going on in my life) and I realized there was one short scene that never made it into season one. This robotic hand.
We did see robotics like this in a flashback in episode three The Stray. However we didn't see this specific image during that scene. We know Westworld had quite a few production issues so perhaps taking this scene out was one of many changes.
You can see this image very quickly in a flash of images toward the end of the trailer.