They did follow the cable to the end - when Hurley was looking for Rousseau- it went into the ground.
The tide finally got high enough to was the plane off the beach.
Hurley told Jack about the numbers. Jack thought he was crazy.
I'm not sure what Sayid has been unable to figure out in the Hatch, I'll need
more specifics on that.
I'm sure they would go looking for those who have been kidnapped, but where do they start? Look what happened when they went after Michael
( Great plan, Michael)
As far as shaving, I think the men (and ladies) still have access to
razors from the luggage - remember Sawyer ranting about their taking
his shaving cream.

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Have a cluckety cluck cluck day.