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.
The Joker's portrayal in the blogs is a lot more sardonic than even the Nolan version, which already took the Joker in a more sour direction.
The Joker's wink to Gambol.
He first admits he has them to Harley...er, Dr. Quinzel...specifically. Given what follows, in might have just been the particular 'in' he found with her. By series 2, her psychotropics-induced dream, which obviously would've been heavily influenced by their sessions both seen and unseen, casts him in the role of arbiter of what is the sensible way to live, and what is crazy.
Base Breaker: A lot of people thought Further Evidence #4 was a bit too goofy for the Nolanverse.
Better Than Canon: "Near-Death Experience", and most especially its dream-state psych ward scenes, is quite possibly the greatest portrayal ever done, be it novels or comics, nevermind officially-licensed films, of the emergence of Harley Quinn. That the material was produced for an indie Youtube channel is almost...jarring, to truly realize.
Complete Monster: Most versions of The Joker qualify and this is no exception. To name a few of his crimes, he kills people almost on a regular basis, holds Lisa Arkham hostage and threatens to kill her unless Dr. Arkham does what he says, kidnaps and torments both Nurse Pearl and Lyle Bolton, and he slowly and gradually manipulates Harleen until she finally snaps.
Crowning Music of Awesome: Well, more like Crowning Moment of Terrifying - The Hall Of The Mountain King in Episode 12, for some reason, is far more terrifying than the Hans Zimmer Joker theme used incidentally throughout.
Fangirls: If you read the comments on the videos, be prepared to either laugh hysterically or weep in fear for humanity. Or both. Especially on Episode 5.
Fanon: In the absence of any Nolan-affiliated reprisal of the role, many fans have come to the see the videos as utterly plausible continuations to the story of the movie...to the point of Scott McClure garnering dead-serious commentary that he should be chosen as the actual movie successor to Ledger himself.
Foe Yay: Like in the film that inspired it, The Joker makes some stunningly suggestive remarks to Batman. "We belong together. There's a wedding ceremony upstairs, just waiting for us to make it official ..."
Good Is Dumb: Literally the only reason Joker is ever successful is because everybody else is a colossal idiot.
Holy Shit Quotient: Axes and Allies: Holy shit, has Batman gone undercover in Arkham Asylum as Matches Malone? Holy shit, is that Two-Face??? Holy shit, did Two-Face just shoot Lex Luthor in the face???
Les Yay: It was a given that Miss Quinzel and Miss Isley would have a little thing going on.
The Joker mentions that he once bit off a guard's finger in order to get the necessary red for his lipstick. Since then, he hasn't had any problems getting the staff to provide him with the makeup he wants.
The Joker leaving a dead orderly with a bow and a label as a present for Dr. Quinzel.
The Joker has a large white bow on the same shotgun he takes into the wedding - another of his gifts. When he pumps it, the bow falls off.
The Digital Download has some deleted scenes, including Dr. Arkham, having an understandable adverse reaction to the events of the night, getting a really horrible Vomit Indiscretion Shot.
Too Dumb to Live: The staff of Arkham Asylum, who do absolutely nothing to lock up Joker or improve security at all despite Joker outright murdering staff members and walking out of his cell at night. Really, it's less that Joker's a Magnificent Bastard and more of everybody around him being an idiot.
It doesn't help that the guards are total idiots without guns. When the loonies start breaking out, all the guards do is scream, cower and run...from unarmed inmates. If they had guns, the breakout would have been much shorter. Furthermore, thanks to the clown filming everything in part 1, there would have been video evidence of the bum working with Joker. So, when he showed up to give Joker a cake, the guards logically would have taken him down. But no, they happily hang out with him and let him slip Joker a fork to escape.
Villain Sue: Joker fills just about every requirement. Even his 'defeat' in Season 1 is only a temporary setback, he still gets everything he wants, and receives no punishment for any of his constant murders.
Win Back the Crowd: Many fans were not happy with the EXTREMELY long wait for Season 2 Ep 2. When it actually did come out? It was 24 minutes long, won back most of the fans with the usual high quality, and now the creators have announced that the next two episodes will be airing next Saturday and the Saturday after that.
Regular updates at hit-or-miss quality, or massive waits for masterpieces that make you scream for them to be longer? You decide.