Superman was never previewed because the producers didn't trust Warners with the film.
That's how you get a performance - they put trust in you.
It's developing a relationship with actors that makes it work.
The betrayal of trust carries a heavy taboo.
Let's say a Soviet exchange student back in the '70s would go back and tell...
Deciding whether to trust or credit a person is always an uncertain task.
Espionage for the most part involves finding a person who knows something...
We'd be working in our motel room through the night and I'd come up with an idea at two in the morning and he'd start jumping up and down pacing across the room or whatever.