19) Kel O'Neill

Kel O'Neill abandoned the set of There Will Be Blood during production, apparently finding Daniel Day-Lewis too overpowering with his intense method of acting. O'Neill claims, however, that his resignation was a mutual decision between himself and director Paul Thomas Anderson. His replacement was Paul Dano, who redid many of the crucial scenes and received praise for his portrayal of both Eli and Paul Sunday. Though O'Neill himself opted to direct, Kel O'Neill's departure is remembered among Hollywood's most notable casting swaps.
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Edited by Abhimanyu Sharma