Yes, even the mowing patterns of the grass at each stadium gets examined prior to the playoffs, as detailed in this New York Times article.

As an example, here's the lowdown on Fenway Park and their "director of grounds", David Mellor:

"Mellor planned a relatively sedate backdrop to start the playoffs, with large squares and triangles, and none of his well-known hose-drawn flourishes like a capital “B” or the two-socks Red Sox logo. But if Boston advances, stay tuned."

Here is a highlight from another article featuring Mellor.

Such designs adorn and distinguish nearly every major league ballpark these days, but no one takes as keen an interest in mowing patterns as Mellor. He has written a book on the subject (“Picture Perfect: Mowing Techniques for Lawns, Landscapes, and Sports”), and is generally considered the top grass-cutting artist in the game. High-school geometry classes visit him at Fenway Park to study ways that an odd-shaped field can be divided and subdivided by straight lines and sharp angles.

“I’m not looking for more work,” Mellor said on a recent afternoon at Fenway Park. “But the grass has to be mowed anyway. So why not do it well, with straight lines, or checkerboards, or something more festive?”

Mellor, 45, gets most of the credit from his groundskeeping cohorts for kick-starting the trend, and forcing countless fans arriving at parks and tuning in to television to wonder: How do they do that?