Caroline appears to Charlie as the spirit of Cal. Cal is on the same football team as Ty and does not want him to find out he is a transsexual. Since spirits appear to Charlie in the patient's form as they are admitted (beginning with Charlie in a tux for all of Season 1 and including the long term coma patient that had been there for decades), then Cal would have had long hair and breast implants when admitted, both of which would have been very obvious to the players in the locker room. For consistency, Cal should have been played by the same male actor that played the patient.
While measuring the burn victim, Dana recites measurements in inches. Since the series is set in Canada, she would have used millimeters or centimeters.