Why didn't he try contacting anybody else?
So Daniel tries and fails for a large part of the movie to track down Harry. He assumes that Helen is dead. But surely he would have had some other friends from 1938. Even if they couldn't directly help him, they could have told him what happened to Harry. Seems strange that he never even attempted to find anybody else that he once knew.
Also, I would have thought he would try to track down the cemetery where his beloved was buried.
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The main reason that Santa is so jolly is because he knows where all the bad girls live