These are some celebrities that were in some classic movies and TV shows. Many of these classic movie and TV shows were played while it was still early in the career of celebrity. Everybody has to start somewhere.
Josh Brolin In 'The Goonies'
Seth Rogan In 'Donnie Darko'
Adam Sandler In 'The Cosby Show'
Hugh Laurie In 'Friends'
Ryan Gosling In 'Are You Afraid Of The Dark'
Stephen Colbert On 'Whose Line Is It Anyway?'
Jessica Alba In 'The Secret World Of Alex Mac'
Tobey Maguire In 'The Wizard'
Steve Buscemi In 'Pulp Fiction'
Jane Krakowski (30 Rock) In 'National Lampoon's Vacation'
Jack Black & Giovanni Ribisi In 'X-Files'
Andy Samberg In 'Arrested Development'
Ron Jeremy In 'Ghostbusters'
John Krasinski In 'Jarhead'
Bret Mackenzie (Flight Of The Conchords) In Lord Of The Rings
Rainn Wilson (The Office) In 'Almost Famous'
Miley Cyrus In 'Big Fish'
Jane Lynch In 'The Fugitive'
Jack Nicholson In 'Little Shop Of Horrors'
Elijah Wood In 'Back To The Future 2'
Jeff Goldblum In 'Annie Hall'
George Clooney In 'Roseanne'
Nicolas Cage In 'Fast Times At Ridgemont High'
Jake Gyllenhaal In 'City Slickers'
Bill Paxton In 'Terminator'