The Lostians walk away from their beach… (click to embeggin)

Walking away, backs to the audience water on our right, and since their backs are to us, it is on their right as well.

cue Lost swoosh, cut to commercial, return from commercial we get.

Now they are facing us, water is still on our right, but has switch to their left.  Impossible to do on an island without a switchback change in elevation, which given the wave, they are still at sea level, and thus is a production error.