Let's say a Soviet exchange student back in the '70s would go back and tell the KGB about people and places and things that he'd seen and done and been involved with. This is not really espionage; there's no betrayal of trust.
I was in Kansas for about a month, and we worked most of the time in a very small town, so it felt like the production basically took the whole town over. In a way, we were the Martians in Kansas.

