Bobby Cannavale may not have instant household name recognition but, with his caterpillar eyebrows and booming New Jersey accent, he boosts everything in which he appears – from “Boardwalk Empire” to last year’s badly received “Annie” remake. Now, he is co-starring in “Danny Collins,” a film about an aging pop star (Al Pacino) who decides to change his life after receiving a long-delayed letter from John Lennon. I sat down with Cannavale and writer-director Dan Fogelman to discuss the lost art of the Hollywood tearjerker, what it was like to rehearse at Pacino’s house, and whether either of them would ever “sell out.” (Fogelman, who wrote “Last Vegas” in addition to “Crazy Stupid Love” and “Tangled,” joked he already had. We all sidestepped the topic of “Annie.”) Both guys did pretty spot-on Pacino imitations.