Calender Girl is based on Calender Man from the comics. (edit) Robin, Nightwing, and Gordon are absent in this episode. (edit)

Miss Solstice: No, please! I'm too young to die!
Calender Girl: Honey, you're never too thin and you're never too young. (edit)

Calender Girl: Beware the Ides of March!
This phrase is taken from William Shakespear's play Julius Caesar. It refers to March 15th, the assassination day of the Roman dictator. (edit) The animatronic dinosaur that attacks Batman and Batgirl is surprisingly intelligent, but more importantly surprisingly resilient. After bashing its head into a rockface, it shows no damage of any kind. (edit)

Calendar Girl's blond haired henchman is obviously based on Fabio Lanzoni. Fabio is best known as the perfect example of the male physique. He appeared on the cover of many romance novels in the 80's and 90's, as well as several I Can't Believe It's Not Butter commercials. (edit) Calendar Girl: Another season, another reason, for makin' trouble.
Reference to the song "Makin' Whoopee".

"Another season, Another reason, For makin' whoopee". (edit)