Corrected entry: In this episode, Capt Chandler orders the disabled boat to be propelled by the use of 3 parachutes, as sails. The ship then makes "14 knots" to spin the propellers to generate electricity. A ship of this size could not even move, given the amount of wind provided. Furthermore, the 3 parachutes are all pointing in separate directions as if the wind was coming from 3 different directions. The parachutes should normally just crash into each other.
Corrected entry: The landing party is going up a river. They expect to lose radio contact with the ship, which they do, and as a back up plan to communicate they use flares, which are seen from the ship. If the ship can see the flares then they could have radio contact within a couple of miles.