Other mistake: After the brief fight between Barnes & Chris, when Barnes has Chris pinned, he cuts him below the left eye with a knife. It is a quick cut with a sharp knife, but instead of a thin bright red line we see instantly a blob of dark blood. This is plain sloppy.
Other mistake: One of the taglines for this film was "Meet Jim Ferguson. He lived a daring double-life with one foot in the 20th century and the other in World War I." World War One was fought in the 20th century.