While Bob Newhart is a father himself, he was adamant about Bob Hartley not having any children. When the writers told him they wanted to introduce a child in season six, he told them the script was good, and then asked them who was going to play Bob. See more...
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Visible crew/equipment: In season 2, episode 6, "Have You Met Miss Dietz?", at 0:07:45 into the episode, the camera is on Carol sitting at her desk talking. Behind her, you see a shadow of someone walking by. (My guess is that it was Jerry Robinson getting into position to enter the scene about 23 seconds later from that same location.)