I enjoy watching "making of" game documentaries -- even to games that might not be my "thing" -- so I'll post a few here for people who might enjoy watching them as well. Feel free to add your favorites to the thread!

The Making of Darkest Dungeon

https://www.youtube.com/watch?v=thQvE6XEmis

The Road To Eternity: The Making of Pillars of Eternity

https://www.youtube.com/watch?v=NA8FfDskw4Q

The Story of Kingdom Come Deliverance

https://www.youtube.com/watch?v=YwE2goNeshY

Raising Kratos: The Making of God of War

https://www.youtube.com/watch?v=ra_R-K_IoUc

<span class="bold">Failing to Fail: The Spiderweb Software Way</span>
This is a frank GDC talk given by Jeff Vogel, game industry veteran. He talks about how his business had survived for over 20 years despite all odds.

Double Fine Adventure

https://www.youtube.com/playlist?list=PLIhLvue17Sd7F6pU2ByRRb0igiI-WKk3D

The Making of Assassin's Creed Origins

https://www.youtube.com/watch?v=nFxN8OfEA9E

The Making of Horizon Zero Dawn

https://www.youtube.com/watch?v=h9tLcD1r-6w

Darksiders: The Documentary

https://www.youtube.com/watch?v=G4i3_-AxhkI

How Alan Wake Was Rebuilt 3 Years Into Development | War Stories | Ars Technica

https://www.youtube.com/watch?v=AoHkGDu0_Hw