During the recap scene at the beginning of this episode, a sketch of The Riddler's waterworks hideout is supposed to shown, but instead a sketch of Dawn Robbins' penthouse apartment is shown which appeared in "The Penguin's a Jinx" from Season 1.
At the end of the episode the narrator says "next week the Joker returns". Next Week the Mad Hatter comes. The Joker returns the following week.
Robin: Gosh, Batman. The utliity belt saves us again.
Riddler: Rats, I am a man of a few words, but a man of many Riddles, so Riddle me this: what is it that is always coming, but never arrives?! [No one answers] Quickly, quickly!
Fangs: Uh, we ain't tuned in on the Riddle bit, chief!
Mousey: Yeah! We give up! What is it that is always coming, but never arrives?
Riddler: Tomorrow. For when it arrives, it is today, and today, my dear rodents, should prove to be most memorable!
Riddler: So many people have tried. The Penguin, Mr. Freeze, The Joker. All masters of their craft, granted. But I, only I, have succeeded in ridding Gotham's criminal kingdom of The Dynamic Duo!
Riddler:(falling into Batman's trap) "What squeals louder than a caught rat? Answer: Several... caught... rats." I've been... outriddled.
Alan Napier (Alfred) is credited but doesn't appear.
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