The funniest play on Broadway last season was, hands down, Douglas Carter Beane’s “The Little Dog Laughed.” The story of a fictional Hollywood heartthrob and his numerous dalliances with a gay-for-pay call boy, the play garnered a Tony nomination for best play, and earned a Best Actress Tony Award for Julie White, who ran away with the show with her rapid-fire delivery and surefire comic timing. In anticipation of its Boston premier at the SpeakEasy Stage Company, artscope correspondent Christopher Caggiano spoke with Beane about why the subject matter was so appealing.