Ken Jeong is auditioning for a TV show being produced by Dan Harmon and Alison Brie is a student on the show. All three have previously collaborated for Community (2009).
In the final scene, where Ken is recording for the show, you can see Richard Erdman, Erik Charles Nielsen, Luke Youngblood and Danielle Kaplowitz as students. The three portrayed the characters of Leonard, Garrett Lambert, Magnitude and Vicki respectively on Community (2009).
Dan Harmon wants Ken to play a Spanish teacher with an anger problem. Ken Jeong played the role of a Spanish teacher in Season 1 of Community (2009).
The "random guy" that Seth Rogen says handpicks his socks is actually his writing partner and long time collaborator Evan Goldberg.