I take it the hostpital one features Olivia Newton-John.

That was filmed at Cape Vicente. Our guide there told us about the 3-4 days of shooting and how gracious Olivia Newton-John was.

The old fog-signal building (now a small museum) was converted into the 'hospital'.

This leads to an error in the film. The flags that fly on the pole next to the lighthouse. The American flag has 50 stars and the Coast Guard flag is of a newer style than ones in 1941.