Oh, yeah, I wrote about this in a previous comment. The mono soundtrack is its own dedicated mix, not simply a downmix of the stereo soundtrack. It sourced the original score stems and, what sounds like, outtakes for that portion of The Nutcracker Suite. If you try lining up the stereo and mono mixes, both versions refuse to lock together without extensive editing.
And do you know maybe where is the surround mix in Thunderbean’s release comes from?