Jane and Joanie develop an unusual friendship. In real life, Calamity Jane was close friends with the leading madam of Deadwood named Dora DuFran. In Jane's later years she earned her keep by cooking and doing laundry for the girls who worked at DuFran's brothel.
When Seth Bullock and Charlie Utter are in the Bella Union questioning Mose Manuel, Cy Tolliver calls Charlie Utter "old man". In real life, Dayton Callie who plays Charlie Utter is only two years older than Cy Tolliver, who is played by Powers Boothe.
Franklyn Ajaye (Samuel Fields) was in the movie Bridesmaids and played Lillian's (Maya Rudolph) father. Maya Rudolph was in the movie MacGruber with Powers Boothe.