The boys in the booth were talking about the windshields. According to them, NASCAR had always required the cup cars to run full windshields on dirt back in the old days. I think most of the drivers would much rather have ran without the windshields. Probably would have been a better race if the drivers could have seen better. I think all the drivers were complaining about not being able to see, especially when the sun was starting to go down and they were trying to see through the mud and dirt covered windshields as they were driving into the setting sun.
NASCAR seems to have always been a stickler for a lot of the old rules that continue to be carried over, and over and over. Gravity re-fueling (cans), 5-lug nut wheels, 15" steel wheels all around, hinged hood and trunk lids (no Lift-Off-Hoods in NASCAR or lift off trunk lids) manual lift (floor) jack (no air lift jacking). Lug nut air (hose) guns, (not battery or electric) so you can get penalized for running over the hose and possibly injure someone with a flying air gun.
Probably a few more such as push rod V8 engines,and no peanuts in the pits or car
Now I know that windshields are still one of those carry overs too. Anything else?