What was Jack Nicholson’s first job in the movies? July 8, 2020 by Pamela Landy Jack Nicholson’s first job in the movies was as an office boy in MGM’s cartoon department. Related Answers How many film versions of Batman have there been? When did Ellis Island in Upper New York Bay open? What are the major cycles of English mystery plays? What Roger Corman produced horror movies featured both Jack Nicholson and Boris Karloff? What was future mayor of New York City Fiorello La Guardia’s job at Ellis Island? What was Ronald Reagan’s first broadcasting job?