In the introduction Alfred explains that the "teaser" takes place during 1878, in Tombstone, Arizona. Arizona did not become a state until February 14, 1912. Prior to this it was referred to as Arizona Territory.
Characters refer several times to "The Dutchman" although he is never seen. He is likely meant to be based on infamous gangster Dutch Schultz, whose nickname was "The Dutchman." However, in 1916, Schultz was only 15 years old. Meyer Lansky would have been only 13.