Yawning man at train stop
Just watched the movie and loved all the 'hidden' elements, especialy the yawning man at the train stop in one scene and possbily the one who scratches his nose is the other.
The yawn was obviously fake (yes I know they're actors) and in my opinion a reference to experiments on contagious yawning. Did you yawn?
I think it was intentional but I may be wrong. Watch it again if you missed it.