Yeah, I think the common denominator - and this is probably going to sound like Acting 101 - but the common denominator is belief in the character in the moment.
“But it's true, it's nothing new that decisions about what movies are to be made, and how they're to be made, and who's to be hired to do what, and whether you hire somebody to do their job, or whether you hire somebody to fill a position and you tell them what to do.”