borisanddoris said:
http://youtu.be/EyozzozRsCk
like this?
Exactly. This is clearly close to the original 35mm source as many of the clips are covered with film dirt. Unfortunately it's a very low-quality transfer so is of very little value as a reference. For interest's sake though:
This scene actually appears as dark, if not darker on the BD:
Trailer

BD

Whereas the shadows in this scene appear to have been lightened for the BD, even accounting for the overall dimness of the trailer source:
Trailer

BD

Then there are shots like these. In this one, it's been speculated that you shouldn't be able to see Jack's face clearly until he steps out of the shadows for the Joker reveal. Though I don't think it was intended to be completely black, I agree that it was probably darker originally:

And in this one where the Batmobile is supposed to be driverless, you can clearly see a driver's hand on the wheel. It's surprising that this goof was missed in post-production so perhaps the original scene was dark enough that the hand wasn't visible:

And then there's just the general sense when watching the BD that many scenes just have a 'greyness' to them and lack of depth due to lightened shadows. Oddly this is not nearly as apparent on my PC monitor as it is on my (calibrated) TV.