Trivia: Robin was originally supposed to be in this film, but was cut at the last minute. His story was that Penguin killed his family during the circus, and wanted revenge, but too many elements of revenge already existed in the film and it would have been overwhelming.
Trivia: The Christmas ball scene is symbolic: since it is a masquerade party all the guests are in disguise. The only guests who aren't wearing masks are Bruce Wayne and Selina Kyle. This implies that their real personalities are Batman and Catwoman respectively, and that their public persona is the real disguise.
Trivia: Michelle Pfeiffer actually became quite skilled with her bullwhip behind the scenes. In fact, the scene where she whips the heads off the mannequins one after another was 100% real, and accomplished in only one take with multiple cameras set up. As soon as "cut" was called, the entire crew burst into applause, shocked by how precisely and perfectly she nailed the scene.
Trivia: The film initially had a rather lucrative McDonald's Happy Meal tie-in which included "Batman Returns" toys with every meal. After the film was released, parents complained about its dark imagery and cynical themes, and McDonald's began to re-market the toys as simply general "Batman" toys as opposed to "Batman Returns" toys. The toys themselves were considered something of a rarity for some time, as a rumor was started that McDonald's pulled the toys from market.