The main problem with season 2 is that there is no grain management whatsoever. They didn't seem to care if one shot was overwhelmed with grain and then the next is DNR's into oblivion.
Here also it shows, how much more clever the guys from CBS-D handled this matter: Instead of DNR sfx scenes, like HTV did, so the special effects, which have no grain, blend in better, they just added fake grain to the SFX, so they blend in to the natural grain of the live action footage.
Not only blend the sfx scenes then better into the 100% live action shots, the sfx scenes also look more sharp and natural due to this.
And that's how it is done!