Here's some clips from extras. The series stars Gervais as a loser actor. Some chapter feature cameo appearances by Hollywood stars.

Outtakes
http://www.youtube.com/watch?v=0mjsTuimR9I&feature=related
Bowie
http://www.youtube.com/watch?v=jv6mEv_rDdE&feature=related
Outtakes
http://www.youtube.com/watch?v=IeUYbgH5XmU&feature=related
http://www.youtube.com/watch?v=0mjsTuimR9I&feature=related
De Niro
http://www.youtube.com/watch?v=VCzJcjwYVZA&feature=related
Samuel L. Jackson
http://www.youtube.com/watch?v=gR81gKiKXoE&feature=related
Daniel Radcliffe
http://www.youtube.com/watch?v=gR81gKiKXoE&feature=related
Orlando Bloom
http://www.youtube.com/watch?v=lh7qzDJG94M&feature=related
Stephen Merchant
http://www.youtube.com/watch?v=OsGH6j_ubJI&feature=related