The entire second season had already been shot before the movie was, even though it actually came out before the second season.
The faking of sea outside a phony yacht window was a clever ruse inspiring a Hogan's Heroes scene in which a kidnapped general is tricked into thinking he is aboard a plane flying at night to England.
The movie was originally intended to be an introduction to the TV series. When the series wound up being produced and aired months ahead of schedule, the movie was made to cash in on the show's popularity.
The opening criminal lair, "Ye Olde Benbow Tavern" is an allusion to name of the tavern in which the the Robert Louis Stevenson novel "Treasure Island" begins, "Admiral Benbow Inn". Commodore Schmidlapp is abducted by the fiendish foursome. The next novel by R. L. Stevenson is "Kidnapped".
The original trailer includes specially-shot footage of the 4 supervillains outlining their plans for the Dynamic Duo. Still frames from these sequences are visible when Batman and Commissioner Gordon watch a closed-circuit TV update on villains at large. The trailer also includes specially-shot footage of Batman and Robin addressing the audience about their first motion picture.
The Penguin's line "We shall hang together, or most assuredly we shall all hang separately" was a humorous phrase spoken by Benjamin Franklin when he was in danger of being accused of high treason by his fellow delegates.
The supporting character Aunt Harriet (Madge Blake) does not have a single line in the picture.