“I just wanted to be in Tribeca so that I can legally refer to Robert De Niro as 'Bob,'” Gilbert Gottfried joked, sitting down with director Neil Berkeley (Harmontown, Beauty Is Embarrassing) at Deadline’s 2017 Tribeca Studio to discuss their documentary, Gilbert. A legendary stand-up comedian and actor with a voice recognizable to many who was propelled to fame in the 1980s, Gottfried was candid about his total reluctance to participate in the project, which peeks…