The box Lou used to move his office items was apparently laying around the set. The numbers on the box are 91608 (crossed out) and 91604, the zip codes for Universal City, CA, and Studio City, CA, respectively. The show was filmed at CBS Studio Center, located in Studio City, CA.
In Lou's new office he is showing Mary and Murray his thoughts on changing the program lineup. One of the shows on the program board is "My Mother the Car". Both Allan Burns and James Brooks were writers on that show.