Trivia: When Richard Collier leaves the men's room, bloodied from his first encounter with a straight razor, the bearded man who stares at him in the hall and declares, "Astonishing!" is screenwriter Richard Matheson in a cameo role. His screen credit at the end reads "Astonished Man."
Trivia: Richard Matheson wrote this film's script based upon his novel, "Bid Time Return." The book was set in 1896 at the Hotel Del Coronado in San Diego CA. But because the "Del" couldn't close to accommodate filming, the movie was updated to 1912 and shot at Mackinac Island's Grand Hotel, which is regularly closed to guests for a few months every year.
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Question: When Richard accidentally pulls a coin out of his coat pocket, he sees that it's a penny and he is sent back to his own time. After being weakened upon his trip back to the future, why, after what was likely several days to get his full strength back, wasn't he able to return to the past? His mentor told him returning to his own time would leave him weakened but, given enough time to get it back, he could have gone back to the past again.