The old man tells Mark and Lucas that he is 72 years old. Actually, Arthur Hunnicutt (1910-1979) was 50 years old when this episode aired.
When Nathaniel Cameron tells Mark that they are headed into a "North Easter", they rush to the window of the train to look out. Then we see a shot of what is supposed to be a cloudy sky. As it turns out, what was actually shown was not just clouds, but a tornado.