The theater dressing room includes a poster for "By the Sad Sea Waves" - a ragtime opera c1898, presented by J. Sherrie Mathews & Harry Bulger (libretto) and Gustav Luders (music), featuring songs by J. Sherrie Mathews, Harry Bulger, Barney Fagan, George A. Nichols, Leslie Stuart and Josie DeWitt. This poster was previously seen in the alleyway in Framed For Murder (ep2.9).
Miss Fisher's house number is 221B, like Sherlock Holmes in Baker Street.
MacKenzie Cavalcade is set in the Royal Exhibition Hall.