In 'Dr. Strangelove', which actor plays three different roles?

In 'Good Will Hunting', at which university does Will work as a janitor? In 'Dead Poets Society', at which fictional school does John Keating teach? In 'The Graduate', who plays Benjamin Braddock? In 'Bonnie and Clyde' (1967), who plays Clyde Barrow? In 'Some Like It Hot', what instruments do Joe and Jerry play? In 'Sunset Boulevard', what is the name of the faded silent-film star? Which film won the Academy Award for Best Picture for 1934? Who directed 'It Happened One Night', the Best Picture winner for 1934?