I made my own 'bootleg' set so to speak, around 2003 when the show was airing on TV Land. It took about two months but I videotaped every episode.
The DVD revealed some clips edited out for time compression, some of which I knew about since I recognized missing lines. But others I was shocked by. For instance, Joker's song when he's about to 'drown' the Caped Crusaders was completely edited out. Also the scene with False Face in his hideout with his henchmen and moll was completed skipped. I didn't even know he had red hair before the DVD!
I may have just not been paying attention on TV Land but I also hadn't previously noticed the female cops in the Nora Clavicle episode appear to be holding rolling pins.
Perhaps the best addition to the DVD is the subtitles. I could never make out the words to Penguin's song when he was running for mayor, and the subtitles fixed that for me.