Continuity: The scene where Garret and Teresa take the boat out for the early morning test sail. The wide shot cutaway as they are sailing out of the harbour has Teresa's left leg bent and laid flat against the boat. The immediate cut back to the two mid shot has Teresa with her left leg bent but lifted off the side of the boat. Pedantic but true.
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Mistakes
There are two rentals cars driven by "Theresa" which have the same North Carolina license tag number, which is displayed on the front where required in Maine, the actual location of filming, but in North Carolina, license plates are not displayed on the front of the cars. See more...
Message in a Bottle mistakes
Factual error: There are two rentals cars driven by "Theresa" which have the same North Carolina license tag number, which is displayed on the front where required in Maine, the actual location of filming, but in North Carolina, license plates are not displayed on the front of the cars.
Continuity: In the scene where Garret finds the messages and bottle in Teresa's bedside table, the candle on the table is lit in one shot, then unlit, and then lit again.