I forget now which book I was leafing through last year, where the author was a frequent visitor to N. Korea throughout the 90s, and there is a chapter in which he mentions state-hired actors:
On the subway, the man embarked and disembarked all day long, travelling his given route.
Same group of kids playing marbles by the govt offices all day long.
Subway trains arrive on time only for foreign visitors' visits.
When he asked his govt aide about these strange events, the man gave a matter-of-fact answer of something like, "we have to keep the image of the country up for visitors. Never know what might happen if you don't control it."
Ain't no Godfather dynasty like the Kim dynasty.
There was also the account of two Swedish salesmen who were allowed entry into the country to sell something or the other to the govt, and when they landed they were on telly immediately, with highly political messages about them being in full support of the "great leader." They were to only travel in govt-issued vehicles and on a given route.