As Roman Polanski’s decidedly awkward “Carnage,” his 2011 adaptation of Yasmina Reza’s “God of Carnage” reminded, faithfully transferring plays to the screen more often than not fails. Dan Mirvish’s “Between Us,” his not-so-obeisant screen version of Joe Hortua’s play (commissioned but never produced by Costa Mesa-based South Coast Repertory), also deals with two married couples ...