Continuity mistake: The dressing that is on the evil Dr Leticia Baines's forehead keeps changing. When she is first placed on Grogan's raft, the dressing is soaked with blood. In the next few scenes it just has a small patch of blood in the centre. After she swims to rescue the boy from his canoe, she gets on the raft and the dressing is dry. In the next two close-up shots the dressing is wet (with water) and then it is dry again.
Suggested correction: While the description of the events and the mistake is accurate, it wasn't Dr. Baines that swims out to save the boy. It was Dr. Hoak. You're thinking of the 1995 remake of the film.