The special is a revelation. I knew about the two sponsor bits, but I never knew the audio had been sweetened sometime later (many sound effects "missing" in this version). There's also missing dialogue when CB is reading the flyer about the lights and display contest.
I've discovered there was at least one animation retake: in this version, when CB first sits down at LVP's booth, there is no snow on the desk, only for it to suddenly appear on it a couple of shots later (for her to clear off). Later versions correct this.
And what's VERY interesting is there is a splice in the exact spot where there's always been (even in complete/restored versions) an awkward jump in the music when they're dancing to the piano. I grew up watching the shortened version with visible and audible film splices (the omission of throwing snowballs at the can, etc), and always "expect" them even when subsequently watching it restored. So it was very strange to see this one happen on the first airing. It's as if there was a negative break and loss of frames even before the thing aired. (I know this print has a couple of splices earned over the years, but the placement of this one is too coincidental not to be original.)
Fascinating!