This is the first time the Clock King is mentioned, even though the character would not appear for another six episodes.
The Minstrel's musical theme is the melody from "A-Wandering Minstrel, I," a song from the Gilbert & Sullivan light opera "The Mikado." In addition, Minstrel's hideout, the Willow Street Warehouse, is a reference to "Willow, Tit-Willow", another song from the same opera.
The character Minstrel was created for the series, but Quality Comics had a music-themed villain named the Minstrel who fought the Doll-Man in the 1940s. When DC Comics bought the rights to Quality's material in 1956, that Minstrel became part of the DC Universe, but never appeared in a DC comic.
Although Leslie Perkins is credited as 'Amanda,' she is repeatedly referred to as 'Octavia.'
When The Minstrel gives the account number for his protection, it is #007 in the Broccoli Bank, references to James Bond.