Very rare appearance of the Joker's car.
The funny money that Commissioner Gordon and Chief O'Hara are examining in the beginning of the episode is in fact a 100 peso bill from the state of Sonora in Mexico.
J. Edward McKinley plays a bank manager named "F. Flam," which no doubt stands for "Flim-Flam." Flim-Flam means to swindle or trick someone, and bank tellers as well as other types of business people have been known to be flim-flam artists.
Music used in Smack in the Middle (1966), when Batman is tracking down Riddler and Robin (actually, Molly), is used when Joker and his moll pursue Batman and Robin.
In this episode, the Joker hides out in a printing company called PENTHOUSE PUBLISHERS. The real Penthouse Magazine began publishing in March, 1965 but was only sold in England until 1969, nearly two years after this episode first aired.