One needs to have the right tricks and tools to make the impossible possible; from body doubles and special effects to green screens and foley sound, this stuff is not for the novice; Saul's film crew unravels the mysteries of movie magic.
A collaborative relationship with one's actors is very important; there's a big difference between "Dance, meat puppet!" vs. "Could we try a slight alt?," so a little nuance and politeness should be used.