 CONT: When Columbo finishes walking on the treadmill at the gym he  enters the office to talk to Milo Janus. Just before he leaves the  office he borrows a pencil from a black box on the desk. When the  camera switches from Columbo to Janus the number of pencils change  from three to one, and they are also pointing in a different  direction. When Columbo puts the pencil back in the box there are  two pencils, but the next angle shows three pencils as Columbo is  heading toward the door.