WPIX in NY started showing the 60s show when the ‘89 movie came out - my parents showed that to me and I looooved it! (Still do!) Here’s the funny part - they told me the show was exactly the same as the ‘89 movie. Liars!
They are actually more right than wrong. The '89 movie, while a little darker than the TV show, is just as cartooney and even borrowed from it in the characterization of the Joker (the museum scene for example, just like the show). The same for Returns when Penguin is trying to me mayor. When I saw it with my father back then, he was disappointed with the film as he expected a more serious take on the character and thought it was still a little campy. I like the movie but it does share some of the characteristics of the TV show.