 Theres always someone from the crew acting as an extra. Some of  them have one line or two: in the meeting room theres always the  production supervisor; you can see the cinematographer as "Customer  with soup" at the "Ombligo del gato" coffee shop; the editor appears  in "La lasaña de Felipe" as a costumer in the line at the register  harassing Sara who is in front of him; one of the camera operators  is the "official" policeman or security guard of the show.