i didn't know they did this, i have it on blu-ray but's not a recent release and i have it on dvd as well. i remember when they did this to Buffy the tv show not the film and they made the episodes where they shot Angel's scenes that were shot in day time well prolly some of them anyways and he's all of a sudden in the sun instead of it being at nite. it's funny yes but not funny enough to buy it to see it so i have no plan on buying that set.
Yeah, Buffy is actually even worse, as they badly framed things and messed up the color timing - that is, EVERY SINGLE SHOT is wrong to some extent, not just selective parts altered like Evil Dead.
Another one (though more minor, as cinematic presentation just doesn't matter as much on it) is Friends on Bluray - they made it widescreen by opening the matte, and lots of times you can see in reaction shots an actor is still talking without audio at the edge, and sometimes lights and other mistakes are visible.
Another thing you'll rarely hear about are audio changes. Tons and tons and tons of blurays and DVDs have altered audio. It's often understandable, a remix to a new format, but I wish they'd always include the original. Sometimes they change sound effects, which I massively despise. A notable example is The Terminator, where they redid the gunshots and the new ones are FAR worse than the original. That's what is on the current Bluray - no option for the original audio at all.