Who played Jeff Spicoli in 'Fast Times at Ridgemont High'?

In which film is Brian Johnson a character? Who played Claire Standish in 'The Breakfast Club'? In which film is Claire Standish a character? Who played Sam Baker in 'Sixteen Candles'? Who played Dewey Finn in 'School of Rock'? In which film is Dewey Finn a character? Who played Derek Zoolander in 'Zoolander'? Who played Lady Bird McPherson in 'Lady Bird'?