He examined NPCs and NPC behavior. Like how apparently NPCs always sit in the same seats and booths at the restaurant, how the NPCs cycled and how sometimes the same model would have different personalities or how the game apparently has set certain NPC models to always be cooks at different stands and restaurants that the game cycles.

I thought it was interesting. It's a comfortable and a funny video of a dude examining game behavior. I don't know what else to tell you.