Found some videos from the Steel Curtain Network film guy from when they hired him a couple seasons ago. Good overviews. 

What struck me most about the run game breakdown is that the guy could find only 1 gap scheme play. Mostly, Smith uses 12 and 21 personnel to run inside zone, outside zone, duo, wham. 

https://youtu.be/C33Bg24P8ng?si=LbzDAEtRRhEVESNf

In the pass game, it looks like Smith likes to use a lot of triangles to give the QB easy reads. Here, the 1, 2, and 3rd read are often on the same side of the field, so the QB can get through his progressions quickly. Smith likes to throw to the RB more than we've seen.

https://www.youtube.com/watch?v=J-1qJlnyd7Y

Then here's a film guy who shows Smith's constraint plays. Seems to like play action and boots, which all work based on a downhill running game. A lot of plays & formations look similar. 

https://youtu.be/RwsDMyyLEJg?si=Xwt8YCkM9_lke2N8

Here's a video from a 3rd film guy who focuses more about Smith's philosophy. The run game is meant to counter the modern NFL lighter-weight defensive run game with a punishing, physical running attack.  The pass game has fast deep threats that keep the defense from loading the box and he also likes to design the pass game to get the ball out quick. 

https://www.youtube.com/watch?v=O3mBfNbsgBc