Factual error: In the beginning of the movie after Tess' divorce and she wants to pursue Nigel to weigh anchor she says that it doesn't make sense to wait at Key West for the helicopter with Gemma. However in the background there are islands with quite high hills visible. The highest elevation in the whole Florida Keys (where Key West belongs to) is 18 feet.
Factual error: When the 206 crashes towards the end of the movie, you can see the prop still spinning under the water. In reality the engine would have stopped and compression would not have allowed this to happen. Also the blades would have been bent and not broken off as you only see two.
Continuity mistake: When Gemma is going into town to go shopping, as the speedboat first drives off the flag is blowing toward the boat's stern, but when she is in the boat the flag behind her is blowing toward the starboard side of the boat, and now with the flag still blowing toward the starboard side the wind blows her hat off to the stern.