 Rendering Gollum would often take six hours for one shot, so WETA  would leave the shot to render over night and check the results in  the morning. Every now and again a computer glitch would occur, for  instance, one morning the team woke up to find every hair on  Gollums head standing upright in a sort of punk looking afro, or  his eyes would pop in and out of his head as he spoke.