Old Norm Head

 was the prototype for Norm's head. This head has black hair, a unibrow and very sarcastic makes an appearance in "Candace Disconnected"; then it was replaced by Norm's nowadays head, perhaps, because this head was too sarcastic. In Dance, Baby!, it was shown he was connected to the table. Before and after the song he was not connected. Either Doof installed him and then took him off, or it was a animation error.