Continuity: There's much too abrupt a transition between Reese falling into the water and his body suddenly being back on the dock. As there's no time lapse implied at all, he seems to reappear on shore by magic. At least a brief shot of the body being fished out of the water might have helped.
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Trivia
Roger C. Carmel, best known as Star Trek's Harry Mudd, played KGB agent Misha Toptegan in this episode. But his end credit lists the character as "Misha the Bear." This was a joking reference to Carmel's years as the voice of Smokey the Bear in hundreds of public service announcements throughout the 1960s. See more...
Updates: 
Series 4
Full Fathom Five (season 1, episode 3)
Revealing: McGarrett's office is on the 2nd floor. Yet the photo backdrops outside his windows in this episode show us a ground-level view of grass, streets and a building. This boo-boo vanishes in subsequent episodes, replaced with the more likely views of balconies, palm trees and blue sky.
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