What other interesting lead performances in high-profile films were based on either a previous performance or a well-known, real-life personality? All I can think of are (a) Albert Finney‘s Daddy Warbucks in John Huston‘s Annie (’82), which was partly based upon Huston’s manner and speaking style; (b) Peter Sellers‘ Claire Quilty in Stanley Kubrick‘s Lolita (’62), which obviously adopted Kubrick’s Bronx-taxi-driver patois; and (c) Tony Curtis‘s “Junior”, the fake Shell Oil heir who romances Marilyn Monroe‘s “Sugar” in Some Like It Hot, and all the while doing a broad imitation of Cary Grant.