Tags changed from "knocked up, micheal cera, akward" to "knocked up, michael cera, awkward" by gold star member rickegee.

It's only an "audition" as a goof - no one auditions on a fully dressed set.
This was obviously done between actual takes on the movie.

Cera's got a part in "Superbad", which I believe the director of "Knocked Up" is producing, hence his appearance here.

Hard to parody this: http://www.videosift.com/video/Yale-University-seniors-embarassingly-bad-video-resume

But Michael Cera does have wonderful comic timing.