The "teamwork" poster in the Sabre test store break room is the same one behind the reception desk back at the office.
This episode continues the tradition of Meredith getting hit in the head/being the subject of violence (the bat being trapped on her head, getting hit in the face with a football, etc.).
Chuck Bartowski, the main character from the NBC action-comedy show Chuck, is referenced several times and used to promote the Sabre Pyramid. John Krasinski looks somewhat similar to Zachary Levi, the actor who plays Chuck. Zachary Levi has even been mistaken for John by fans.
In "Test the Store", we learn the 9-digit zip code for Dunder Mifflin, from Darryl: 18505-7427.
It is revealed that Stanley is only happy when he is on vacation