Terri Garr appeared as the uncredited ice skater. She was 19 years old at the time.
The "Star of Kashmir" Mister Freeze targets is a play on The Star of India, one of the largest and most famous star sapphires in the world. As of January 2016, it is on display at the American Museum of Natural History in New York.
During his appearances on Batman, Mr. Freeze's actual name was Dr. Shivel. In the comics, his actual name was unknown for many years. It wasn't until "Batman: the Animated Series" where he was given his full name of Victor Fries (pronounced the same way as "freeze"). This name and his new backstory was later incorporated into the comics as well as the motion picture "Batman and Robin".
Mr. Freeze was based on a comic book villain named Mr. Zero. Mr. Zero's name was later changed to Mr. Freeze to match the television show.
Mr. Zero was renamed Mr. Freeze for this series. The named change eventually made its way into the comics as well.