The Bat Ram is used for the first and only time in this episode. It was visible underneath the front bumper of the Batmobile in the previous episode, "The Ring of Wax". Outside of this two part episode, the Bat Ram is never seen or utilized.
Although the ancient jewels are mentioned by Aunt Harriet during the museum visit, they are never seen.
Linda Gaye Scott said on Facebook that when Moth fell into the tub as she was trying to escape at the end of the episode, it was "sort of accidentally on purpose", and the director asked her to stay in it until Adam West pulled her out.
All the instruments of torture used by the Riddler and/or his gang in this episode - the rack, the wheel, the pillory, the gibbet, and the scalding tub - were used extensively to extract "confessions" during the Spanish Inquisition.
The Bat Communicator seen here appears to be a cross between a walkie talkie and a hand held transistor radio. Like the Star Trek communicator being used in the original TV series, both were precursors to the modern cell phone.