In any case, we don’t know whether the 1910 film used the just-a-dream ending—or perhaps the film itself was just a dream of a 1940 obituary writer.
One review at Silent Hollywood indicates that the ending has Martin awakening from a dream and there is no explicit mention of actual time travel. With this in mind, we’re marking the time travel as debatable. Oh, and Mark Twain himself appears in the film, played by Karl Formes.
Based on Hank’s knowledge of the castle and its displays, the time travel definitely occurred in this version, with both the travel back and travel forward caused by clonks on the head. And based on the ending, Hank might not have been the only traveler through time.