It should be no surprise Omaha native filmmaker Dan Mirvish keeps finding ways to make indie features. After all, the L.A.-based mensch is the author of the bestselling book, “The Cheerful Subversive’s Guide to Independent Filmmaking,” and cofounder of Slamdance Film Festival. His latest offering, “18 1/2,” is a cockeyed Watergate political thriller meets screwball-romantic […]