When Sci Fi announced in 1991 that they had bought the entire run of DS to begin airing on their channel, Worldvision took a good look at the old tapes, and decided the show needed a face lift. Worldvision remastered the episodes, and made slight cuts to almost every one of them. In an effort to make the show look "better" to 90's audiences, they edited out all the video glitches, and technical flaws on the old tapes. For example, many episodes contain glitches in the video from just age. There are bad splices, resulting in a black screen for a few seconds. Or the tape would simply "jump" from being damaged over the years. Worldvision was very clever, because they would replace the bad scenes with a freeze frame of a previous scene or some such video editing. A good example of these edits can be found in episode #673. At the end, Amy starts to burn Chris' shirt. In the original tape, the video breaks up from damage right at the part where Chris finds his burning shirt after Amy has run out. Worldvision removed the damaged scene, and replaced it with shots of the burning fireplace, that was pulled from the same scene a minute earlier!
In answer to Joe's question, that dance scene from 1897 was edited exactly for the reason's I have described. The video started "breaking up" because of the effects they were trying to do with those statues. It caused severe interference with the video. Frankly, I thought this was a very badly directed scene anyway. I would have preferred to have seen Quentin and Pansy dancing throught out the entire song. Not the dull motionless statues.
For those purists who want to see the entire show uncut and with all the video glitches, MPI offers them untouched on DVD and video.