In 1994, Jean-Jacques Beineix made a documentary called Otaku. It features a nine-minute tour of Nintendo's offices, and it is wonderful to watch.
The original recording is in French (and has circulated online for a while), but ComputerTales recently uploaded a version featuring machine translation into English which, while jarring, still at least lets you know what's going on.
There's a lot of interesting stuff discussed about the Super Nintendo and origins of Mario, but the highlight might be seeing Miyamoto do some quick sketching for the cameras.
And getting to see the stuff he has at his desk:
— Chris Kohler?! (@kobunheat) April 28, 2017
You can see the full thing here: