When Todd Baylor looks up "Joseph L. Rinaldi" in the phone book, Rinaldi's address is listed as "1416 N La Brea." This address, or some version of it, is a very popular one in the series. It has been, or will be, seen in at least three other episodes. It's the address of the studio where the indoor scenes of the series were filmed. It's now the home of the Jim Henson Studio.
Actor Ed Prentiss's character is listed as Taped Voice. The character's actual name is George Baylor.