Dumbo: Ah, BD versus Big Top Edition DVD: http://www.dvdbeaver.com/film2/DVDReviews50/dumbo_blu-ray.htm
Grumble, I hate all 3 releases. I'm prepared to recommend none.
Edit: Okay, confirmation about Disney rotoscoping out characters, adjusting separately, freezing the background and recompositing.
The blu-rays may look beautiful and represent a version of the film, but they are divorced from film as a medium. They are the movies as if they were made today.
In the next update I will remove pretty much all Diamond Editions (and most BD's of early films).