| Rainn Wilson | Dwight Schrute |
| John Krasinski | Jim Halpert |
| Jenna Fischer | Pam Beesly |
| Ed Helms | Andy Bernard |
| Catherine Tate | Nellie Bertram |
| Leslie David Baker | Stanley Hudson |
| Brian Baumgartner | Kevin Malone |
| Creed Bratton | Creed Bratton |
| Clark Duke | Clark |
| Kate Flannery | Meredith Palmer |
| Ellie Kemper | Erin Hannon |
| Angela Kinsey | Angela Martin-Lipton |
| Jake Lacy | Pete Miller |
| Paul Lieberstein | Toby Flenderson |
| Oscar Nuñez | Oscar Martinez
(as Oscar Nunez) |
| Craig Robinson | Darryl Philbin |
| Phyllis Smith | Phyllis Vance |
| Clay Aiken | Clay Aiken |
| Hugh Dane | Hank |
| Nora Kirkpatrick | Esther |
| Mark McGrath | Mark McGrath |
| Mark Proksch | Nate |
| Aaron Rodgers | Aaron Rodgers |
| Santigold | Santigold |
| Jessica St. Clair | Casey Dean |
| Nico Evers-Swindell | Cpl. Miller |
| Ryan Bailey | Producer
(as Ryan Kyler Bailey) |
| Rachel Crow | Gabriella |
| Scot Robinson | The Bartender |
| Calvin Tenner | Glenn |
| Steve Carell | Michael Scott
(archive footage) (uncredited) |
| Cham | Acapella Idol Contestant
(uncredited) |
| Sean L. Malin | Andy's Competition
(uncredited) |
| B.J. Novak | Ryan Howard
(archive footage) (uncredited) |
| Victor Taylor | Auditionee
(uncredited) |
| Dale Waddington | Kaitlyn
(uncredited) |