 CONT: After the camera goes back down the staircase and out the  front door into the market, a man walks past with a big sack of  tomatoes to cover the transition from the studio shot to the  exterior. Before he passes (the studio shot), the door frame on the  right is clean, but afterwards (the exterior), a greasy black stain  can be seen on the right of the "real" door frame above the  doorbell. Also in the exterior shot, a lampshade and the shadow of  the archway over the interior door can be seen reflected in the  window over the stairs when no such reflection was seen in the  studio shot.