In 1893, Samuel Clemens was traveling on book tours, mostly in Europe. He only returned to the U.S. briefly (New York City) and moved his family to Berlin, Germany. It is unlikely that he was in the San Francisco area at all.
LaForge: So, do you want to talk about it?
Data: You refer to the foreknowledge of my death?
Data: I have no particular desire to discuss the matter. (pause) Do you need to talk about it?
Data: Decomposition strongly indicates that life was terminated approximately five hundred years ago. That would be consistent with the other artifacts we recovered.
Riker: Your head is not an artifact.
Jerry Hardin's previously appeared in season 1, episode 17, "When The Bough Breaks" as Radue.
The newspaper Data reads is The San Fransisco Register, the same publisher that Kirk got a newspaper from in Star Trek IV: The Voyage Home.
Samuel Clemens used the alias "Mark Twain" when writing books.
Marc Alaimo previously played Badar'N'D'D in "Lonely Among Us," Commander Tebok in "The Neutral Zone," and Gul Macet in "The Wounded." He would later play Gul Dukat on Deep Space Nine and Officer Burt Ryan in DS9's "Far Beyond the Stars."
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