This episode marks the first live action appearance of Tweedle Dee and Tweedle Dum.
The Penguin's campaign slogan "Make Gotham safe again" is reminiscent of Donald Trump's slogan "Make America great again."
Harvey notes that he would make a "kickass PI". Donal Logue played a PI in the short-lived yet adored FX show Terriers.
Alice, The Mad Hatter, and Tweedledee and Tweedledum are all characters in Lewis Carroll's books about Alice in Wonderland. Books Hugo Strange referenced last season.
This marks the second time that actor Ari Barkan and director Eagle Egilsson have collaborated. The first time was on NBC's The Blacklist.