When the book "The Mysterious Island" is found in the sand, the woman who found it tossed it aside, near where she was tanning on the beach. She then runs into the water, which is several metres away. In the next scene, the book is caught in surf washing up on the shore. It was left far above the high-water mark.
When the survivors wake up on the beach, they're all shown with sand on their faces and in their hair. After they get up and walk around, they're completely spotless, even their clothing.
When Chase hits the coconut on the bottom to crack it open, the top pops open.
At 12 half minutes the guy and girl were trying to start a fire with lenses but it would never have worked as they were in the tree shade not the sunlight.