The first script draft of Batman Returns was intended to be a direct-sequel to the previous Batman (1989). As a result, sub plots and continuity from the first film that would have been addressed included gift shops selling fragments of the destroyed Bat-Wing, further revelations into the past of the now deceased Jack Napier AKA Joker, and even Bruce Wayne proposing to Vicki Vale by the end of the film. However, Tim Burton was uncomfortable in making a direct sequel and as a result, the script was rewritten. However, several plot elements from the original script did make it into the final draft. This included the Penguin and Catwoman's alliance, their framing of Batman, and the Dark Knight's escape via Bat-Glider. Further elements even made their way into the third film, Batman Forever (1995), most notably an invasion of Wayne Manor and the Batcave.
When asked how he got into the violent, baseball bat-wielding mindset of "The Bear Jew", Eli Roth partially attributed his performance to the historically accurate costumes: "Being in wool underwear will make you want to kill anything." He also stated (in a separate interview) that his girlfriend had secretly added some Hannah Montana (2006) music onto his iPod; when he listened to it, it inexplicably made him able to tap into the violent nature of The Bear Jew.