Yeah, that was a weird one that had no commentary about the sardines which most people would've been curious about. Instead they mention Jackie Chan multiple times and he needs no explanation!
It's a great example of an ecosystem flourishing around a built-out infrastructure. There are canned drink vending machines on seemingly every corner (commercial and residential) in Japan.
For me, Pocari Sweat is the king of Japanese sports drinks. It has been a few years since I visited Japan, and I still have a unopened bottle of Pocari Sweat "on standby" :)
You can't just mention sardines and then not talk about it.