When Tammi sets off the flare at the end of the film she aims it behind her and to the right. When the flare goes off the shadow cast is from the front and the left.
At the start of the movie, Tammi accidentally cuts herself while shaving her underarm. She uses some tissue to clean up the blood and throws it into the sink. Although she only bled a trickle, the tissue is almost soaked through.
The crew mention that the yacht is registered in Panama and therefore falls under Panamanian laws when in international waters, the port of registry on the aft of the yacht is visible, and it is mentioned as "Durban" which is in fact South Africa. The ship cannot therefore be Panamanian registered.