Early in the movie, Aunt Harriet makes a statement to Alfred saying "can you believe the lengths those two go to keep their little secret?" and "you really don't see it?" The statement highly implies that she believes that they are both gay and possibly lovers.

At one point, Catwoman admonishes Robin to "keep your hands to your self" when he has to knock her out to keep the Batcave's location secret. Catwoman and Batman share a number of kisses and near kisses. Catwoman is flirtatious in many of her interactions with Batman.

Bruce leers over Miranda Monroe while watching her on television as his descent into evil progresses.

As with the series this animated film is based on, much stylized and humorous fisticuffs (complete with "Pow!" "Biff!" "Zap!" overlays) are on display during the setpiece fight scenes.

Batman attempts to kill Robin and Catwoman by placing them in the Batcave's nuclear silo (a reference to the death of a character in the very first two-parter in the original show's run, one of the only times where any character was known to have definitively died). They escape from the predicament.

Catwoman is shot out an airlock of a space station, but is shown to have had no ill effect whatsoever to the exposure to hard vacuum.

Batman and Robin are threatened with death in a elaborate deathtrap of the kind routinely used in the original series (this time they're tied to a gigantic TV dinner that is slowly being moved towards an gigantic oven).

Catwoman falls to her apparent death by apparent suicide rather than be captured by Batman again.

As befits the source material, no actual profanities. At one point, Bruce refers to Aunt Harriet in demeaning terms but not obscene ones.

As one of the "Holy (insert term here)" running gags for Robin, he invokes the name of the film "Faster Pussycat, Kill! Kill!" a joke that will go over the heads of children watching, but still a film that they're better off not seeing due to its explicit content.

Batman at one point swills champagne (actually an antidote to Catwoman's drug) straight from the bottle. Other than that, all alcohol and tobacco is missing -- even Penguin's cigarette, which he was never seen without in the original '60s series.