When Ziva is talking to Tony in the bathroom they reveal that Tony was double parked when he went to Ziva's apartment to question her. When we viewed the event from Zivas point of view she notices Tony's car but it isn't double parked.
Dr Mallard and Palmer were discussing PFB - pseudofolliculitis barbae - of the dead victim with shaved head. PFB is not the same as razor burn. Razor burn is the irritation of the surface of the skin caused by shaving. PFB is hair curling into the skin by those who have curly or coarse hair.