"The Ocean" is fans as seen from the stage. It was always dedicated to the audience at concerts.
The voice on the intro is drummer John Bonham. When he says, "We've done four already, but now we're steady and then they went, 1... 2... 3... 4...," he is referring to the takes. They had tried to record it 4 times prior but couldn't get it right, so as a pep talk he said his famous line.
In the last line, the "Girl who won my heart" is Robert Plant's daughter Carmen, who was 3 years old at the time.
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