Continuity mistake: When the Seagrass is attacked, the two girls are thrown through the cabin's rear windows, landing on the outside deck. When the boat's owner finds it, a camera circles the Seagrass from a distance and the rear windows are intact. When he and Elizabeth board the boat, the windows are again broken.
Continuity mistake: Stevie's radio station is shown located in a lighthouse, yet the night shot early in the film shows an entirely different lighthouse than is seen in daylight mid-way through the film. The later version's top, red portion isn't nearly as tall, and it has at least a third of its glass replaced with solid panels, while the earlier one is taller and all glass.