You'd be shocked to by what nature creates that we find as erroneous displacement here in Terragen. Often I'll knit-pick both clouds and displacement, and take a walk through the woods (always interesting cliffy stuff and erratic boulders and stuff) and be immediately corrected by nature doing all sorts of absurd geometric shapes, even in clouds that I often pass up in seeds as (bad).
Granted, straight tears into the huge void that is a the planet is another story. lOl
The trick really, is mixing these types of noises with other noises, less noises, etc, to create a realistic continuity. When I find something interesting in nature, it isn't repeated over and over.