When looking up the song about the Star Handled Stranger, Dr McKenzie and his colleague comment that not many people could read back in those days (the late 19th century). In fact, literacy rates for white Americans were very high in the mid and late 19th century. At the time of the Civil War, somewhere around 90% of white men could read and write. Literacy rates on the frontier a generation later would have likely been somewhat lower but literacy for whites would have been the rule, not the exception.
When Georgia Crawford first meets Dr. McKenzie at the shooting range, he turns to her in surprise, holding both his pistols in his hands. After a brief conversation, she asks him if he is going to draw on her, and after that we see both of his pistols back in his belt. Although we don't see his hands during the conversation, we see his upper arms which obviously don't make any kind of move as to put the guns back in the belt.
Special effect not synced with action. When Dr. Cole is standing in the field holding the time device in his hand, you can clearly see his hand moving around and under the glass while the device remains fixed in position and does not move with his hand.