i always thought nobody paying any attention to the joker in clown make up was because the virals set up the fact that all around town, people were spotted wearing clown make-up, and it had become just another thing in crazy old gotham. also, the virals set up how meticulously the joker planned the heist, including the thing that people seem to forget is that we all as a group helped him find the bus routes and the right times and such. half the virals were setting up the bank robbery....so yeah, i guess if you werent a part of those, technically a lot of this stuff is questionable, but it all had an explanation.
also, a lot of you need to get a crash course in what a plot hole is. just because events transpire off-screen does not mean they are plot holes. that's called leaving it to your imagination. so not knowing how harvey gets out of the hospital is not a plot hole. we just dont see that happening because we watch the joker leaving the hospital. you can assume time has passed between the end of their conversation and the joker blowing up the hospital. that's how movies work.
a plot hole is not the joker not having make up on underneath the mask and then having it when he takes it off. thats called a continuity error/make up error/something else entirely. or it's called movie magic. who cares?
a plot hole can unwind the entire fabric of the script. the entire script does not unravel if it seems silly that the joker can pull a bus out into traffic. it's also pretty silly that two-face can even walk around, let alone speak intelligibly and hold his own in a fight... but it's just something we take with the heightened reality of nolan's gotham. he never professed to complete realism- he professed to complete realism within the world he's created. huge difference.