A large part of the machinations of 14/48 is the random nature of everything. A random theme is drawn, random cast assignments (i.e. 2 men, 3 women) are given to the playwrights, the directors pick their play and their cast at random.
Given this, and chaos being what it is, there are times when certain patterns emerge, and you'll have a weekend where an actor will get cast as a hobo from Kankakee with a penchant for flashing on both nights.
Okay, not really, because that'd be kind of lame, but you get the idea.
Here then is Shawn Belyea explaining the models of the handful of patterns that have emerged over the years.