Yea, I remember reading/hearing about that as well at some point. Apparently he continued to tweak some of those songs, especially after he began the Bad World Tour and got a feel for how some of those songs sounded live. I wonder if there is a list of changes that folks have noticed between the originals and the remasters. I've had the special editions since they came out over a decade ago but it's never really occurred to me that they had been tweaked from the original releases. I think I also read somewhere that the bridge on Human Nature was slightly different from the original mix. Subtle things like that I find quite fascinating and I wonder if we have any insight as to why certain changes were made.
The different bridge was in a Japanese single release, not the original album as far as I recall. The original Thriller LP has a different mix of Billie Jean, with the most noticable differences, although subtle at the lines "she called me to her room, hey-ay" in the horns.
The original LP versions of Rock With You and Get On The Floor don't have handclaps, ie. in Rock With You, the versionw e are used to go goes "I Wanna Rock With You [CLAP!] all night, Dance you in[CLAP]to the, sunlight" where as it is just the regular snare drum alone in the original version.
The bad differences are the most noticable, the horns during the chorus of bad, the lack of ad libs in The Way You Make Me Feel, the lack of breathing and different sounds in Smooth Criminal, the intro of I Just Can't Stop Loving You.
Noticable mention to the original LP version of Torture which doesn't have Jackie's ad libs. That album as a whole sounds glorious on vinyl. It makes the album sound less "80s effects" and more musical.
The recent 2016 vinyl release of Off The Wall is quite nice as it has the single mixes of Rock With You and the updated Get On The Floor, which I think are better than the original versions, but it's nice to have both. Whereas I have Bad 25 on vinyl and it is a mere shadow of what the original BAD LP sounds like, which is magnificent and glorious and all things nice.
Despite no changes in mixes, Dangerous on LP blows you away. The clarity is phenomenal. Not much better than the original CD release, but it is a different experience. Also, as I've said before, the re-mastered MOV version of Invincible also actually sounds like music and not computer generated noises all loudly stuffed together, making listening to Invincible a VERY enjoyable experience.