Hey,
No, as far as I know, it doesn't start or affect any of the processes going on.
But it can let infection in easier so it is always best to wait until near the end of the development so the snake doesn't end up sitting in a cess pit.
I always wash out any grey film or funky looking spots with water the same temp as the eggs. I keep a water sprayer in the incubator for that purpose.
dr del