When the victim is arguing with her mother at the end of the episode, her mother's shawl appears and disappears repeatedly when shown from behind.
In the teaser, when the 1919 detective is entering Frances's death in the ledger, the header reads: "Bureau of Police, Department of Public Saety," instead of "Safety."
The song "There'll Be Some Changes Made" by Sophie Tucker, playing during one of Frances' arguments with her mother, wasn't published until 1921.
The Stone family is worried in June 1919 about the suffragettes because they believe that if women are allowed to vote, Prohibition will pass (the family is wealthy because they own a brewery). However, in reality, Prohibition (the 18th Amendment) was ratified in January 1919, five months before the flashback events in this episode take place.