Plot hole: While it fits his style, the Joker's larger scale plans rely on a sequence of events that are largely out of his control and depend on an extremely precise sequence of events, timing, and luck, such as Harvey Dent or Rachel being saved (Dent remaining alive in the shootout, the Joker being caught, the police reacting in specific ways, a way to cover his escape). The hospital sequence likewise requires no one discovering planted explosives ahead of time, and him sneaking in prior to evacuation.
Suggested correction: Although your logic is solid, the Joker is a master opportunist and can change his plots midway to fit his needs. Had Harvey died, he may have targeted Commissioner Gordon or the Mayor as a replacement. We learned the Joker wanted to be caught so he could get to the financial planner for the mob bosses. As for the hospital, he may have simply removed his makeup like he did when he disguised himself as a police officer earlier and worn a surgical mask to cover his scars.
Plot hole: The Nomex survival suit that Bruce gets from Lucius Fox in Batman Begins is bulletproof, knife proof, and can stop anything but a straight-shot, per Fox. All Bruce did was spray paint over it to make the batsuit. But in the beginning of The Dark Knight, Batman gets mauled by a dog which chews through the suit and cuts Bruce's arm, causing him to need stitches.
Suggested correction: The suit still has seams, through which the dogs can bite.
The suit he was wearing is knife proof, meaning there's aren't suppose to be any "seams" for a dog to bite through. It was the later suit he requested that would be vulnerable to knife attacks.
Lucius told Bruce in Batman Begins that it would stop a knife, he didn't say it was knife proof. This was likely in reference to protecting vital organs from stab attacks, etc, not the weakest areas in his armor from dog bites. There was always going to be flexibility, protection, and weight consideration trade-offs for optimization purposes with any armor he wore, not just his 2nd.
