From what I see joked about in tv and film: toilets.
From what I know from people who have actually been there personally: Vending machines.
Also they have the most advanced KitKat flavors in the world. I want them. But they're like specialities of specific regions kinda like Pokemon. It's wild.
Well it's moot anyway; I'm in the US where Nestle sold all their confectionary brands. I just noticed all the kitkats at the store I shop were branded by Hershey now and had to look up wtf. I noticed this before with another candy not too long ago, too. Didn't realize it was literally all their candy brands in the US.
They have more drink vending machines than you'll believe, with a huge variety ofcold and hot drinks and even soup, but essentially no food vending machines.