According to the 2016 book "Batman: A Celebration of the Classic TV Series", a line was cut from the scene in which the Joker is released from prison for good behavior. The Joker was supposed to remark "Like sixty-four years ahead of time".
In this episode, actor Dick Kallman plays a man who has an antique nightshirt stolen from him by Joker and Catwoman. Ironically, 14 years later, Kallman, by then a dealer in fine antiques, was shot and killed, along with his business partner, by a man robbing his antique store. He was only 46. Although the criminal was eventually captured, tried, and sentenced, none of the stolen items were ever recovered.
Orangey the Cat, a star in his own right, plays Catwoman's feline companion. He was also the original spokescat for 9 Lives Cat Food