That diopter example is it--exactly. There are at least two or three shots with it not very hidden as in that example posted from Resevoir Dogs.

Tservo, the print was spotless except for some wear at the reel changes which got a tiny bit obtrusive but not bad. in the last reel there was a small line in the final confrontation a bit but it was very minor.

(Should be all of them IIRC) Reel changes:

Selina shocks clown

Bruce watching Penguin appear on TV in the Manor

Mayor's press conference

Penguin kicking the clown's body into the water

The Batskiboat crashing onto duck

I agree about the Joker reveal. I always thought it should be darker based on the descriptions by people who worked on the production and the general look of the film. Now I'm fully 100% convinced that it is indeed darker.

As for WB Kubrick masters, the color can be all over the place. These were done primarily in 2007 for the SE DVD and eventual early BD releases, and in many ways are outdated. 2001 we have already proven is incorrect, and it differs from SK's preferred dictated timing on the Criterion CAV LD (and 35mm to boot). Barry Lyndon seems okay but is at an odd ratio that caused furor. Lolita looks perfect, Clockwork takes some odd choices and remixed audio, FMJ seems fine, The Shining is an odd one but I can live with the 1.78 masked HD master.

Eyes Wide Shut doesn't feel the way it should and many have claimed the disc looks nothing like the 35mm print version and it also doesn't live up to the primary deep color Kubrick shot it for.