What happened to Steve's and Alicia's deep penetrating stab wounds? Both of their wounds were in sensitive areas that needed immediate emergency surgery, yet both walk away without even a limp.
McGarrett uses a kelp stipe (Giant kelp, Macrocystis pyrifera) to rescue himself and Dr. Brown from a water-filled lava tube. However, the Hawaiian waters are way too warm for kelp to grow there.
The truck that was found burned was in fact a much older model than that of Steve's.
The information on the screen says "Two miles East of Makapu'u Point". If they are travelling in a van they would be underwater as Makapu'u point is the easternmost point on the island.