The theme of connection really hits at the end when Sam decides to quit Bridges and take care of Lou, who was his only genuine connection the whole time. I'm not sure he meant it but it speaks to the fact that a worker's only genuine connection at their jobs are their fellow co-workers, and the upper management at Bridges (everyone else) constantly stress that Lou is a piece of equipment, and not a fellow human being, even though Lou is the only person to share Sam's (and your) experiences.