The RoyalGoofs
Continuity
Series 3 Episode 5 "Poison" Dr Ormerod says goodnight to Sister Brigid, then walks out of the door from Casualty to the Ambulance Bay. As he approaches the door, his coat is unbuttoned, but when he reaches the other side of the door it is completely done up.
Character error
Although she is a nun, Sister Brigid clearly has plucked eyebrows and is often shown wearing lipstick, all highly unlikely for a woman who has taken the veil.