As for DVD, nope, never again, too much edge enhancement on practically every release.

Poltergeist looks very good on blu ray, much better than the DVD edition but i think a brand new 4K scan done today using the best equipment and a higher bitrate encode would make it look better, i also would not use DVDBeaver for screencaps, they often forget to adjust settings for REC.709 and sometimes the brightness is too high because they are not using PC levels, indeed they have used PowerDVD and that brings in some additional issues and results in softer images.

As for colour balance, Close Encounters was a brand new 4K scan approved by Spielberg, i think it looks superb and i think its pretty close to how a great looking prestige cinema presentation would look.

I have the region 2 DVD SE same version they used for the bluray as they usually do to make fools of us. The colour of the blue is all WRONG! Note the tiny traces of green being produced by the hot white “Go into the light” Yeah that is not how its was seen in the cinema with pure xenon light shinning onto pure grain 35mm!
Look at the DVD Beaver screen captures of first edition region 1 now out of print, but there are still plenty of idiots who would sale there’s for the bluray.

http://www.dvdbeaver.com/film2/DVDReviews33/poltergeist.htm

After seeing the beaver shot I brought the region 1 DVD and never play the region 2 SE much less buy the bluray lossless or not I don’t care the colour balance as crossed over to the dark side on this bluray.

The discrete 6track DOLBY STEREO film mix is the same as the region 1 it uses the original monaural surrounds with clear and often heavy bass and sub bass LFE.1 that gives me JUMP towards the end when coffins rumble and burst though the kitchen floor!

Nice use of dialogue voices in the living room as friends watch a football game them the sound of TV on right stage channel while. TV remote control wars, now that is possible! If you have neighbour that you like to play a prank on and they have the same set-box he he aim the remote at their box and start pressing the next channel LOL. They’d be wondering WTF for days??

Personally I’d look for the region 1 of ebay you won’t be disappointed.
As for this type colour issue its cropped up countess times on many other films and its the wrong colour balance.

The Abyss
Terminator 2
Terminator 3
The Sum of All Fears
Batman Begins
Cape Fear (1991) In one shot towards the end the river scene on the boat with thunder and lighting outside.
Close Encounters of Third Kind
Poltergeist
StarGate
Blade 2

Oh I can list a whole lot more!