It would be nice to be able to use the “original” values for the filtering like you can use the “corrected” values now. This would be handy for when you are reviewing the corrections, for instance, going through by original album title would allow you to see very quickly that some of the “corrected” values aren’t correct if a track or two jumps to another album. Now you pretty much have to count the tracks in the “new” album and make sure that 1 or 2 aren’t missing. It would also make it much easier to highlight the tracks and then either do auto-correct or match to one release on just them.
I’m not sure of what you can do with your UI, but perhaps a right-click on the filter title could allow you to change from one to the other quickly.
It would also be nice to be able to filter on additional fields, as well.