These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Bizarro Episode: "Bat-Mite Presents: Batman's Strangest Cases!" It features Scooby-Doo dancing the polka... and that's one of the more sane moments.
Black Hole Sue: Batman himself is this. Despite supposedly being just a "normal" human, he constantly shows up heroes that are far more powerful than he is and routinely easily beats up villains that should be powerful enough to beat him in a single punch, while everybody constantly praises him as the "best hero EVER!" Even having an entire episode devoted to said more powerful heroes trying and failing miserably to take over for him for a while.
Given that the show is a mostly an action comedy in the Adam West vein the various Sue-tendencies attributed to Batman may be intentional.
Crazy Awesome: Red Hood, especially under torture; and of course the Joker himself.
The whole damn show.
Ace the Bathound's jetpack.
Joker's jetpack and how its powered. And his choice of weapon to combat Batman's light saber. A RUBBER CHICKEN!
Creator's Pet: Batman himself in a few episodes, which is especially annoying since he's the main character and the reason every is watching the show anyway. Two notable times are in "Night of the Batmen!" where several groups of heroes all simultaneously and independently note how amazing Batman is and in "Powerless!" where everyone is outraged that someone might not think Batman is the greatest person in the world.
Notably averted in the Flash-centric episode "Requiem for a Scarlet Speedster!". Flash's rogues easily dispatch Batman, all while commenting on how lame he is in comparison with The Flash. Even after Batman gains super speed he still is little more than a distraction and it's up to Flash to stop the bad guy.
Batman being crushed with a giant hammer and his soul drifting to heaven replete with harp, angel wings, and scowl, corny; him being melted in a vat of acid to the bone horrifying, everything afterwards is just plain funny.
Evil Is Sexy: Catwoman. Well, as Batman himself says, she's not exactly "evil" per se, like his other villains, but he does seem to like her more when she behaves meaner. Like this dialogue from "The Knights of Tomorrow!";
Bruce Wayne: I forgot how cute you are when you're threatening
Joker's Emperor costume, compared to its comic counterpart. It has a whoopee cushion in the crown.
Foe Yay: Taken beyond subtext. Batman lets Catwoman escape, Catwoman gives Bats her number.
Heatwave, Weather Wizard and Captain Cold all have this for Barry Allen when the world thinks he's dead. They interrupt their own robbery to complain about how boring and unimaginative an opponent Batman is next to him, and how "Geezer Flash" and "Baby Flash" just aren't the same. They're quick to deny it when Batman accuses them of missing him, but their delighted reactions when he returns say otherwise.
Sorceror Felix Faust helps Batman undo Batwoman's spell that switched their bodies, all the while thinking that 'Batwoman' was the same woman she'd always been, oblivious to the fact that the original spell had done its job. When he's talking about how he'll miss her after the body-switch was successful and Batwoman's off to prison, Batman asks him if he realizes that it was him in Batwoman's body. He smirks and replies:
Jonah Hex and Lashina are positively dripping with Foe Yay throughout "Duel of the Double Crossers!" It even ends with the two of them riding off together.
Bordering on Ho Yay when Bats teams up with the Joker.
Joker when Bats brings him to the Batcave and he sees the mementos inside: "An entire wing for moi? I knew you cared!"
Bat-mite lampshades Batman's relationship with Joker in "Emperor Joker". Then it is deconstructed when we see how horrible it is to be on the receiving end of Joker's attacks; even Bat-mite realizes it since he's helpless and chased by his own "Mini-Joker".
Genius Bonus: In "Mayhem of the Music Master," the titular villain at one point flees from Batman along five telephone wires arranged like a musical notation staff... and his quarter-note-shaped vehicle jumps from line to line to follow Neil Patrick Harris' singing.
In the cold open for "Night of the Batmen!" Vigilante's fingerings and strumming are accurate to the music he's producing.
Harsher in Hindsight: In "Dawn of the Dead Man!", Batman is trapped in a limbo between life and death, acting as a ghost. He sees the gateway to the afterlife, with his parents urging him to join them. This is a little unsettling given that the episode premiered two days after the release of Final Crisis #6, which ends with Batman's death. Or as revealed at the end of the last issue, what looked like it at first glance.
And this episode shows the start of Deadman's friendship with Batman. In Justice League, we saw such a relationship come to an end. Deadman was forced to possess Batman to save the heroes from Devil Ray, killing him, but when it's over Batman realises he did it by using a gun. Bats does not look happy about it.
In "The Knights of Tomorrow", Old Joker is given six months to live due to the chemicals he's used over the years. Now, take a look at Joker in Arkham City...
There's a short gag about Sportsmaster out with his family on a roadtrip. Come Young Justice, and his character is a prime example of an Abusive Parent.
The entire concept of the show, a celebration of the rich, varied history of the DCU, in light of the New 52 and its disposal of this same history.
At the end of Mitefall, the execs ultimately feel a Darker and Edgier show will do better and cancel Brave and the Bold. However, this apparently isn't the case in real life - the ratings for Beware the Batman haven't been anywhere as good as Brave and the Bold's, leading to Cartoon Network to eventually abruptly pull it from the schedule, causing several fans of it to fear it could be facing early cancellation, especially since the hiatus mirrors the prior abrupt one both Young Justice and Green Lantern: The Animated Series went through, as their own cancellation was announced right before the hiatus ended.
Heartwarming Moment: Admit it, the ending scene to Mitefall, especially Batman's breaking the fourth wall speech to the audience brought a tear to your eye.
The very first episode has Blue Beetle arguing that Batman would always beat Superman in a fight because "Batman always has kryptonite". The third season kicks off with Batman actually fighting Superman...and he doesn't have kryptonite. And gets flattened.
Green Arrow (voiced by James Arnold Taylor) calling out Batman flirting with Catwoman (voiced by Nika Futterman) in "Inside the Outsiders!", considering the Dating Catwoman-esque sexual tension between Obi-Wan and Asajj Ventress (voiced by James and Nika, respectively) in Star Wars: The Clone Wars.
Ho Yay: "Menace of the Madniks!" is basically a Ho YayLove Triangle between Ted Kord and his two friends, Batman and Booster Gold. That may just be a Fandom Nod, since Ted looks slightly awkward all the times Booster hugs him.
Jumping the Shark: The final episode "Mitefall!" has Bat-Mite attempt to invoke this, because he's gotten tired of BATB's comedic formula and wants a Darker and EdgierBatman toon. He alters the series to hit all the classic JTS marks (including having Ted McGinley Other Darrin AQUAMAN), while Ambush Bug (voiced by the original shark-jumper himself, Henry Winkler) tries desperately to prevent him. Since this is the last episode, Bug and Batman ultimately fail to save the show, but at least they make sure it goes out with its dignity.
Ironically enough for the viewer, Bat-mite's changes almost makes the show So Bad, It's Good in how silly the show becomes, including with NEON TALKING SUPER STREET BAT LUGE!
Considering one of the posts that didn't make it into the second thread screencap had her identified as the daughter of the Anti-Spiral, as well as a brief reappearance to call on her brother to avenge her, it's probably not over.
She basically shows up as a constant annoyance every so often these days.
Strawman Has a Point: in "Joker: The Vile and the Villainous!". While Joker and Weeper are obviously only trying to sabotage the Bat-Probe because it would make crime more difficult, the fact that the Bat-Probe operates by summoning the police whenever it detects malicious intent veers dangerously close to prosecution of thoughtcrime. Batman acting a lot jerkier than usual doesn't help.
They fixed her in the second episode she appears in.
Unfortunate Implications: "Return of the Fearsome Fangs". Out of all the students in the dojo, the only one the old master couldn't stand was the black one, despite three others being essentially jerks.
He didn't seem to like any of them, to tell the truth. It was more like Tiger was the the one who couldn't stand the master or at least put up with his crap until he graduated.
Many of the female heroes in the show have "want to jump Batman's bones" as their motivation for tagging along on adventures. Hell, Black Canary's song is literally about how desperately she wants a relationship with Batman!